3/8 ball head with ARRI locator pins for use with magic arms and other ball head clamps - Space GreyAluminium Ball Head with 3/8-16 ARRI-Style Anti-Twist Screw designed to be used with various ball head magic arms and ball head clamps. Your accessory secures using the thumbscrew and you can add torque by using an Allen key. One end secures into the magic arm or clamp and the other end features a 3/8-16 thumbscrew with ARRI-style anti-twist locating pins for securely attaching accessories. The ball end features a blue rubber gasket for additional grip.• Compatible with most Magic Arms Friction Arms and Israeli Arms using a dual ball head system• Ideal for replacing a 1/4 version adds extra security and stability due to the ARRI style locator pins which prevent twisting and loosening• Material of Construction: Aerospace Grade Aluminium Rubber• Mounting: 1 x Ball Head 1 x 3/8-16 Screw with ARRI-Style Locating Pins• Length: 2.5• Dimensions: 2.5 x 0.98 x 0.98• Weight: 1.7 oz