Duct-O-Wire 12G C-Track System - Trolley-Bumper: FC-TRB2, Hard Rubber Bumper with mounting screw. 5/8" Diameter.

Manufacturer: Duct-O-Wire    Made in U.S.A.

12 Gauge C-Track System - Trolley Bumper:  FC-TRB2,  Hard Rubber Bumper with 8-32 mounting screw.  5/8" diameter.  Adds 1/2" per bumper to trolley length.  Weight: .06 Lbs.