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Quantity
1
The RAP-B-378U consists of a 2.5" composite B size ball base, double-sided adhesive PSA stick pad, and sealed alcohol prep pad. This base will attach to all RAM® B size double socket arms, allowing you to connect a compatible device holder.
4.3
11 ratings
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Wrong size
I bought it in the B Size section expecting that size but it ended up being smaller.
Thankfully it came with a separate flex tape circle I was able to attach to my current B size ball mount and use it that way
Robert · October 15, 2026
This is the second one i have bought. The first time the adhesive failed and the second time, the ball and stem broke off the base. Not the right product for mounting a phone on a vertical surface.