Camlok Girder Clamp, Series TTR, 350 to 3300 lb, 14 to 1 in Jaw Opening, 258 in Bail Opening Width, 712 in Overall Width, Cam Locking CM TTR Clamps can be used on Girders and rolled Steel joists up to a surface hardness of 300 Brinell 32HRc These Clamps are designed for handling structural Beams with the flange in a vertical position or H position