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 that is easy to lock and will not loosen, effectively avoiding wear and tear on the locking 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 bits. The large one is suitable for 15/64inch-7/16inch; the small one is suitable for 3/64inch -3/16inch metal drill bits The drill stop can be used for furniture installation, ordinary tiles, wood, metal, plastic and brick. Colour:red Material:metal aluminum Package Contents: 4 x Countersink Drill Bits 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.