【3 Tungsten Steel Alloy Cutter Heads】Our door hole drilling kit has 3 different hole cutters, made of special tungsten steel alloy, which is higher quality than high-speed steel. It can securely grip most wooden doors of any thickness. Using vertical guides with height and depth stops, overshooting the cutting area can be avoided with this tool set. 【Versatile and Easy to Use】The door hinge clamp can be used for new door frame unlocking holes, replacing fingerprint locks, opening door grooves, door frame deadbolt grooves, unlocking holes, opening eccentric holes, replacing large lock bodies 【Service】: We are very sorry for the shopping experience you have experienced. If you have any problems with the goods you received, please contact us and we will serve you 24 hours a day. 【Industrial Grade Linear Bearing】The slider moves more smoothly and accurately, and will not get stuck after long-term use. The silicone dustproof and shockproof sleeve prevents sawdust from entering the bearing slider and causing it to get stuck. 【Peripheral positioning screws】effectively control the opening distance for easy positioning. The bearing seat slide rail is adjustable and can be freely adjusted left and right. The open design provides a larger operating space.