1. The outer ring is made of high quality material, , beautiful and light, with anti-skid lines on the , which can be tightened manually, which is simple and practical. 2. Nylon inner ring, easy to lock, not loose, and effectively avoid the abrasion of the locking part of the drill bit. 3. The inner diameter of the stopper is adjustable, suitable for 8-12.7mm drill bits, and can be fixed on different positions of the drill bit to accurately control the drilling depth. colour:Red Material:Aluminum alloy Package Contents: 1 x Woodworking Drill Locator Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.