UNI dolly buffer, support flange widths from 91 - 300 mm, pack of 2. Supplied = flat pack. Product type = accessories. Universal dolly buffer for support beam profiles with parallel flange (91 - 300 mm support flange width) Can be used for all makes of manual drive dollies and electric drive trolleys. Fast assembly without annealing, welding and drilling. Assembled, positioned and clamped on the support beam within a few minutes. Universal for assembly on the bottom or top support track. UNI dolly buffer size 4, can be used for support flange widths from 91 - 300 mm. 1 pair.