Manfrotto 3/8 Anti–rotation Adaptor Compatible with 244 Mini & 244 Micro 3/8” Anti–rotation adapter is compatible with the following friction arms: 244 Mini Friction Arm, 244 Micro Friction Arm, 244 Micro Friction Arm with Anti-rotation. The adapter can be replaced using the included hex key. The Anti-rotation system is compatible with Manfrotto products: 055 series, 190 series, & 386B-1 Nano Clamp.