Hejnar Photo 2.375 Inch conversion Clamp for Manfrotto 054, Manfrotto 055, Manfrotto 057, Manfrotto 494, Manfrotto 496, Manfrotto 498 Ball Hads 2.375 inch long Weight: 4.9oz (135g) Precision C.N.C. machined from 6061-T6 Aluminium. Stainless steel hardware. Black hard coat anodized surface.