SmallRig 4900 Rosette 11inch Magic Arm with ARRI Locating Screw, made of aircraft-grade aluminium and stainless steel, features 1/"-20 screws and stretchable pins at one end, ARRI Locating screw at another end for securely attaching such accessories, particularly with anti-twist holes, as monitors, LED lights, microphones, mobile phones, iPads, action cameras, etc. The thumbscrew helps lock accessories and has holes for the hex spanner for further tightening; and the ball heads, which are 360-degree adjustable, come with a spiral pattern to increase friction and bear up to 3kg / 6.6lbs of load. At the stainless steel rosette joint, there is a spring for easier angle adjustment. An ergonomically designed anti-off thumb lever, with a built-in thrust ball bearing, feels smooth and comfortable and quickly locks arm and ball heads in a second. This rosette arm is CNC machined for more robustness and durability and is also equipped with pads on both accessory mounts to prevent scratches.