Features: brand new and high quality Be made of brass material ,smooth surface, not easy to rust, good looking and durable. The size of Depth Stop Ring is 6/8/9/9.5/10mm, suitable for twist drills, wood drills, glass drills, etc. Be used to limit the depth of the drilling hole and improve the drilling efficiency. Instructions For UseMeasure the drill diameter and select the size of depth stop collars. Loosen the limit ring screw. Insert the limit ring from the handle of the drill bit, adjust to the appropriate depth, and tighten the screw. Specifications: Material: brass Dimensions: 6mm, 8mm, 9mm, 9.5mm, 10mm(optional) Package Includes: 1 x Drill Locator note: Due to the light and screen setting difference,the items color may be slightly difference from the pictures. Please allow slight dimension difference due to different manual measurement.