Feature: *Available on countersunk drills, making drilling, countersinking and reaming a single step. *Adjustable stop ring allows you to set the screw head flush with the surface or drilled. *Countersink will drill pilot holes and countersink or screw countersink step by step. Counterbore for driving screw heads flush with or slightly below the surface. *The purpose of this limiter ring is to make your work easier and the drilling depth more accurate. *The product contains 2 sets of limiter rings, countersunk bits are not included. Specifications: Product Name: Limiter Rings Material: Metal Color: Black,Silver (As shown) Length: (Approx. ) 29mm Suitable for: Countersunk drills, Counterbore for driving screw heads flush with or slightly below the surface. Quantity: 2set Package Included: 2set Limiter Rings Note: 1.Transition: 1cm=10mm=0.39inch. 2. The real color of the item may be slightly different from the pictures shown on website caused by many factors such as brightness of your monitor and light brightness. 3. Please allow slight manual measurement deviation for the data. _x000D_