The Manfrotto 244 MICRO Variable Friction 3/8 and 1/4 Adapters permits you to switch a stand or camera arm with a female 3/8-inch attachment to a male 1/4-inch attachment. It also enables you to convert a stand or accessory with a female 1/4-inch attachment to a male 3/8-inch attachment. It has a hex nut center section that can be used to tighten and keep the spigot secured by using the hex key. These adapters are compatible with the 244 Mini Friction Arm, 244 Micro Friction Arm, and 244 Micro Friction Arm with Anti-rotation.