Features Precise Alignment Every Time: These self-centering bits ensure hinges are perfectly positioned, allowing for flawless installation in any woodworking project Durable HSS Construction: Crafted from high-speed steel, these bits offer exceptional hardness and longevity, standing up to rigorous drilling tasks Effortless Operation: Designed for ease of use, this set allows for quick drilling and tapping, significantly enhancing your work efficiency Reliable Positioning Accuracy: With chips automatically discharging from the drill, you can maintain accurate positioning without the risk of bit shifting Versatile Size Selection: Includes 6 essential sizes tailored for carpenters, cabinet makers, and furniture builders, catering to a wide range of woodworking needs Features: 1、 These self centering drill bits put hinges right where they should be in the center 2、The inside drill bit is made of HSS, high hardn, proof, solid and 3、Easy to use, drilling and tapping, high working efficiency 4、Positioning accuracy, will not shift, the chips will automatic discharge from the hole on either side of the top of the drill, not stuck drill 5、6 of the most often used sizes for carpenters, cabinet, furniture makers and other wood working trades Specification: Features: These self centering drill bits put hinges right where they should be in the center. The inside drill bit is made of HSS, high hardn, proof, solid and . Easy to use, drilling and tapping, high working efficiency. Positioning accuracy, will not shift, the chips will automatic discharge from the hole on either side of the top of the drill, not stuck drill. 6 of the most often used sizes for carpenters, cabinet, furniture makers and other wood working trades. Specification: Material: HSS, Aluminum Size: approx. 5/64'', 7/64'',9/64'', 11/64'', 13/64'',1/4'' Weight: approx. 177g Opening size: 5/64'': Opening diameter: approx. 2mm, needs approx. 2.2-2.8mm Self tapping screw 7/64'': Opening diameter: approx. 2.8mm, needs approx. 3-3.5mm Self tapping screw 9/64'': Opening diameter: approx. 3.5mm, needs approx. 4-4.5mm Self tapping screw 11/64'': Opening diameter: approx. 4.5mm, needs approx. 5-5.5mm Self tapping screw 13/64'': Opening diameter: approx. 5.1mm, needs approx. 5.6-6.1mm Self tapping screw 1/4'': Opening diameter: approx. 6.m, needs approx. 6.8-7.m Self tapping screw Using Manual: According to the hardn of the wood to adjust properly, if the wood is soft, you can choose a small number, if the wood hard, you can choose the corresponding one or larger one. Package included: 6 x Self Centering Hinge Package List