Makita A-55158 Cup Diamond Dust Collection Cover (for Disc Grinders) Outer Diameter 3.9 inches (100 mm)

This product was exactly what I needed and exceeded my expectations. I purchased this product to fit onto my Makita 7" grinder with a cupped grinding wheel. Initially I purchased the diamabrush brand grinding wheel with the replaceable teeth, which did not work well at all for removing Thinset or epoxy paint from concrete. The diamabrush wheel skipped all over the place and left large marks in the concrete instead of a smooth finish. One note about this attachment is that you have to use a cupped disc, there is not enough clearance to use a flat disc. I read all the reviews on this dust shield and others, and was a little afraid of the fiber skirt falling off like others said but it never happened to me after 1000 sq ft of Thinset removal. This dust shield does have a small discharge outlet, but I found that using a hose from a smaller shopvac fit perfectly, and was able to duct tape the other end to my large shop vac which kept the dust down to a minimum. I did have to remove the small piece that allows for getting really close to cabinets and walls. When the small piece is removed it does not collect dust very well. Overall I'm very pleased with my purchase and I am impressed with the amount of dust control achieved with this product. Here are the pros and consPros: lightweight, durable composite material, removable outter piece that allows for close to wall grinding, dust skirt around the bottom, contoured inner grooves which channel the dust directly to the discharge outlet, easy installation.Cons: it is a bit pricey but ultimately worth it, small discharge outlet without accompaning adapter.Overall, this dust shield kept the dust down to a minimum and fit onto the Makita excellently. My main concern was silica from grinding the concrete. A few things to note for a do-it-yourselfer; it really pays to spend $20-$30 on bags for your shopvac if you want to really control the dust and prolong the life of your filters. If you own a shopvac brand, most of them will accept bags. If your shop vac has a small black plastic piece on the opposite side of where the hose is installed, you should be able to take that out and install a bag onto it and place that inside the shopvac. This not only prevents dust from clogging your filter, it also prevents dust from seeping outside of the seal where the motor unit sits on top of the bucket portion of the shop vac. It's well worth the money if you are concerned about keeping the dust down to a minimum. I still used 4mil plastic and painters tape to tarp off all the cabinets and rooms where there was no Thinset. Luckily we had nice warm weather and high winds that day so all the doors and windows were open to allow dust to migrate outside.The main reason I purchased the Makita grinder was because it had this attachment, and I figured it would probably be a good fit and it in fact did fit onto the grinder perfectly. I researched the universal ones and only read that the fit was marginal at best. I would highly recommend this for anyone removing Thinset or grinding down concrete. I opted for the 24 tooth rigid cupped grinding wheel, it was about $90 at Home Depot, comparable to here on Amazon. I didn't get from Amazon because I needed it that day when I discovered the flat disc wasn't compatable with this dust shield. I've attached a picture of the diamabrush disc that does not work with this dust shield attachment.I hope others find this review helpful! Good luck with your concrete grinding!!!

Purchased this item to go with diamond cup type wheels, such as the Dewalt DW4775 or similar wheels available at the big box stores. Used with a Makita brand 7" angle grinder, a good tapered vac hose adapter, and a hepa or fine dust filter shop vac, this provides mostly dust-free operation except when the front shield section is off. The spring-loaded shield and perimeter brushes maintain a nice seal, which causes the vacuum to pull the grinder down to the concrete.Using the 7" grinder and cup wheel on concrete with this shield makes quick work of leveling paches in concrete due to bathroom repairs or patches to divits left by carpet tack strip removal. This really helped us with our remodel.Our remodel project had coatings on the concreate as well as various small patch repairs. We needed to use the 7" grinder to get into tight areas or areas that could not be wet with a hose. The cup type wheels were agressive and good on straight concrete, but not ideal.For coating removal, we used Diamabrush on our grinder. Diamabrush removes epoxy and other dried paint type products, carpet glue, etc. faster and smoother than the cup type wheels.This shield does NOT work with non-offset flat-backed wheels such as the Diamabrush diamond flap wheel because the spring mechanism extends too far into the dust collection area. The local big box store rented us an older Makita grinder that had a fixed (not spring loaded) metal shield that cleared the Diamabrush just fine. We had to fabricate a "skirt" for it out of duct tape, however then it produced dust-free result as good as this shield. There are other "universal" type shields on Amazon that may work for the Diamabrush.During our project, it was not possible to work well with the shield and grinder unless we used a good extension cord and a 20 amp circuit. The dust extracting shield made the dust situation so well controlled that we could speed up to the full capacity of the grinder, which trips a 15 amp breaker.

This works "well enough" but I don't think it had worked quite as well as the Dewalt shroud I had used prior to this one as far as containing dust with a Dust Deputy + shop vac setup. Really the key when grinding thinset is just having a vacuum setup that helps contain some of the dust as you're working and get it off the floor so you can see what you're doing. These shrouds aren't magic bullets that eliminate any and all dust, they're just assisting in keeping pieces of thinset from flying up and helping to get a bulk of the thinset / sawdust vacuumed up. The room will still get plenty dusty.I wouldn't pay more than $50 or so for a shroud. When 3rd party sellers have this for $100 that seems ridiculous when you figure the larger Makita grinder tool itself can be bought for less than $150. Find a different shroud in that case.