is the length adjustable by a few inches?

No. There is no way to adjust the length

What size drill bit ?

Sense I was drilling into very hard tile I started with the smallest bit I could buy then went to the size rewired for the anchor. I went though several bits in the process. It probably cost me as much for bits as I paid for the grab bars. However in the end it was worth it. They look nice and the followup nurse and occupational therapist both were impressed and took pictures and information on where we purchase them.

ASIN	B09573WDVL
Best Sellers Rank	#195,274 in Health ( See Top 100 in Health ) #252 in Shower Grab Bars
Brand	Tesuchan
Brand Name	Tesuchan
Color	Stainless Steel
Colour	Stainless Steel
Customer Reviews	4.7 out of 5 stars 1,662 Reviews
Finish Types	Polished
Finish type	Polished
Item Dimensions L x W	40.6L x 5.7W centimeters
Manufacturer	Tesuchan
Material	Stainless Steel
Material Type	Stainless Steel
Product dimensions	40.6L x 5.7W centimeters
Style	Modern
Style Name	Modern
UPC	707025750223
Unit Count	16 Grams
Weight Capacity	Minimum weight: 226.8 kg

2 Pack 16 Inch Anti-Slip Shower Grab Bar with Ergonomic Soft Silicone Grip, Safety Bathroom Grab Bar (Lengthen Concealed Screw), Handicap Bath Grab Bars for Pregnant, Elderly, Injury Senior,

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