Is the item made of metal or plastic

Metallic medium length version: RAM-B-201UComposite (plastic) medium length version: RAP-B-201U

Does this accommodate a 1 1/2" base but still allow the 1" ball at the top?

yes that's the application I used

Will this socket arm be able to hold smaller balls like 17mm types that are more common with garmin or other phone mounts?

No, this will only work with the 1" ball, but in a pinch I guess you could 'wrap' the smaller ball with leather or something to give it a similar diameter. Most folks will buy the bigger ball to put on the phone mount as it's more secure that way.

ASIN	B000WJA5ZY
Best Sellers Rank	#11,318 in Automotive ( See Top 100 in Automotive ) #16 in Car Ball Mounts
Color	Black
Customer Reviews	4.6 4.6 out of 5 stars (4)
Date First Available	4 August 2012
Item Weight	240 g
Item model number	RAM-B-201U-C
Other display features	Automotive Parts and Accessories
Product Dimensions	17.78 x 5.08 x 5.08 cm; 240.4 g
Special features	Adjustable
Whats in the box	RAM MOUNTS RAM-B-201U-C

RAM-B-201U-C Double Socket Arm (Long) Compatible with RAM B Size 1" Ball Components

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