The RAP-277U is a double thick octagon button (RAP-280U) and PSA adhesive disk pad. The RAP-280U is commonly used with the RAP-B-200-1U and RAP-200-1U composite octagon button arms.
RAP-277U Features:
Warranty: Manufacturer's, RAM Mounts (National Products Inc.), Limited Life Time Warranty.
Material: Black composite.
Description: Includes the RAP-280U is a double thick octagon button (shown below) and adhesive disk pad.