StiX Clamp for 1" Ball End Strobe Support Arms Our clamp is made to allow the maximum freedom of movement possible on a 1 inch ball system. Smooth gripping of the arm is assured by a full spherical ball socket. A captive locking screw prevents accidental disassembly. Made from high tensile aluminum with a black hard anodized finish. Sculptured and carefully machined to be smooth to the touch. Weight: 2.25 ozs.