Manfrotto 635 Quick-Action Super Clamp (Black)A great update to a traditional favorite, the rapid action locking jaw has also been applied to the most well known clamp in the world, the original Super Clamp. These modifications allow us to keep its extreme versatility adding unrivaled speed in locking and unlocking. Supplied with wedge to allow the clamp to fit on flat surface. Attachment (bottom): 16mm hexagonal and M5 and 1 4 Inch threads; clamp range max. (round tube): 0. 51 in.; clamp range