Hejnar Photo 1.50 Inch Jaw Length Clamp for Arca Swiss type Plates and Mounts. Made in U.S.A

Standard 1.50 Inch Arca Type Clamp. Center socket is countersunk on top for 1/4-20 or M6 screw, but also threaded 3/8-16.Tongue-in-pocket Design - Clamps have a tongue-in-pocket design that protects internal parts from dust and grit. It does prevent the tendency of the moving jaw to hinge backward during clamping, It keeps the jaws aligned with the geometry of the plate and eliminating unwanted bending forces on the threaded stud. Made in USA.