Convenient tension bar for working in narrow or deep spaces. Once the tip tool is inserted, it will lock and not fall out. The movable grip can be detached. The bit mounting part is domestic standard type. KOSEI locking extension bar is sold by DCM. We also carry many other tip tools (bit and socket). Caution: Do not use for anything other than its intended purpose. Keep out of reach of children. Please be sure to install and replace bits. Please wear protective glasses when using. Please make sure to use the correct application and size.