The Leofoto LHC-60 60mm Screw-Knob Clamp w/QR Plate LHC-60 is an Arca-type receiver clamp with 60mm long jaws, designed to convert existing ball heads to Arca-type quick release systems. It features an ergonomic knurled knob for easy operation and a precision scale for accurate placement of compatible quick release plates. The clamp includes an integrated bubble level and a 3/8"-16 threaded mounting socket, making it ideal for customizing shooting rigs or replacing existing clamps. Leofoto LHC-60 60mm Screw-Knob Clamp w/QR Plate LHC-60