Features: . Made of high-quality material for maximum strength and durability. The anti-fall steel ball is better fixed, the locking device itself is not easy to slide off, and it fits tightly. The handle has a regular 1/4" (6.35mm) hexagonal shape, which makes the mount stronger without slipping. The hexagonal handle can be easily converted and connected. After installation, the hexagonal connector can be converted into a square head, so it can be used to assemble the sleeve. Suitable for screwdriver chuck or electric screwdriver tool (hexagonal hole or three jaw chuck). The size of the opposite side of the square head is the specification of the post, and the combination of multiple specifications is optional.