Hlightweight metal aluminum, strong hardness, wear resistance, high temperature resistance, this kind of drill stop has a long service life, better performance than plastic, strong fixity The drill bit limit ring set can accurately control the drilling depth without damaging the drill bit, with a nylon inner ring is easy to and will not loosen, effectively avoiding wear and tear on the part of the drill bit. Making these drill depth limiting rings perfect for and DIY enthusiasts to use in production or repetitive drilling projects The inner diameter of the two fitted drill bit depth stop can be adjusted for precise application of different size drill . The one is suitable for 15/64inch-7/16inch; the small one is suitable for 3/64inch -3/16inch metal drill The drill stop can be used for furniture installation, tiles, wood, metal, plastic and brick. Colour:red Material:metal aluminum Contents: 2 x Countersink Drill Only the above content, other are not included. Note: Light and different displays may the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.