Premium-grade clamping system, compatible with and automatically centring pressure on edge of Clamp-It® Assembly Square (sold separately). Featuring a fixed head with ergonomic handle and moveable tailpiece, and throat depth 3/4″ to centre of jaw. Maximum opening capacity 4-1/2″ (114mm). Available sizes 5, 8 and 12″ (127, 203 and 305mm). Premium-grade clamping system, compatible with and automatically centring pressure on edge of Clamp-It® Assembly Square (sold separately). Featuring a fixed head with ergonomic handle and moveable tailpiece, and throat depth 3/4″ to centre of jaw. Maximum opening capacity 4-1/2″ (114mm). Available sizes 5, 8 and 12″ (127, 203 and 305mm).