The outer of the drill bit in the utility model is provided with a bushing and a self lock, which can carry out safe self locking, so as to prevent any injury on lateral soft tissues. 本实用新型的钻头外设有套筒和自锁器,自锁器可起到安全自锁作用,以防止损伤侧软组织。
The utility model relates to a hole enlarging drill bushing, which belongs to a processing knife tool. 本实用新型是一种扩孔钻套,属于加工刀具。