100% brand new and high quality The outer ring is made of aluminum alloy, durable, beautiful and light, with anti-skid lines on the surface, which can be tightened manually, which is simple and practical. Nylon inner ring, easy to lock, not loose, and effectively avoid the abrasion of the locking part of the drill bit. The inner diameter of the stopper is adjustable, one tops multiple, suitable for 8-12.7mm drill bits, and can be fixed on different positions of the drill bit to accurately control the drilling depth. Quantity: 1 Quality is guaranteed, please rest assured to buy Specifications: Material:Aluminum Alloy+Plastic Color :Red Scope of application:Suitable for 8-12.7mm Drill Bits note: 1.Please allow 1-2mm errors due to manual measurement, make sure that you do not mind before you order. 2.Due to the difference between different monitors, the picture may not reflect the actual color of the item. Package Includes: 1xAdjustable Drill Stop