Detailed design: high-precision blade with a suitable negative forefoot design, taking into account the strength and sharpness of the blade. At the same time, a large core diameter is used to enhance the rigidity of the tool and stabilize the cutting and chip removal.Woodworking hinge hole punch hole opener twist drill with wrenchspecification:Material: high speed steelTool handle type: HexagonType: straight shank twist drillDiameter: 13/64", 1/4", 5mm, 11/64", 7/64", 5/64", 9/64"feature:4 pieces: 5/64" +7/64" +9/64" +11/64" +1 x wrench7 pieces: 5/64" +7/64" +9/64" +11/64" + 5mm + 1/4" +13/64" +1 x wrench8 pieces: 5/64" +7/64" +9/64" +9/64" +11/64" + 5mm + 1/4" +13/64" +1 x wrench16 pieces: 5/64" +7/64" +9/64" +9/64" +11/64" + 5mm + 1/4" +13/64" + 8 x twist drill + 1 x wrench-16 sets, including 8 twist drills, for your convenience.-High carbon steel, strong and durable.-13/64" is suitable for self-tapping screws of 6-6.5mm.1/4" is suitable for 7-7.5mm tapping screws.5mm is suitable for 5.5-6mm self-tapping screws.11/64" is suitable for 5-5.5mm self-tapping screws.7/64" is suitable for 3-3.5mm self-tapping screws.5/64" is suitable for self-tapping screws of 2.2-2.8mm.9/64" is suitable for 4-4.5mm self-tapping screws.Package Included:4/7/8/16Pcs hole opener1 x wrench