The drill chuck key is composed of a handle 1, a body 2, a spring 3, and a small shaft 4 (as shown). A knurling in the handle matches the hole in the body, which acts as a double layer of the handle and the spring seat, and the small shaft slides with the small hole in the body. When the key is used to clamp the drill bit and the removal is forgotten, the key will automatically pop out due to the spring force.
Magnetic Separation Pulleys,Magnetic Head Pulleys,Magnetic Rollers
Yongze Magnet Co., Ltd. , http://www.nb-magnets.com