4pcs hinge drill (silver)Specifications: 5/64'',7/64'',9/64'',11/64''7pcs hinge drill (silver)Specifications: 5/64'',7/64'',9/64'',11/64'',5'',13/64'',1/4''8pcs hinge drill (black)Specifications: 5/64'',7/64'',9/64'',9/64'',11/64'',5'',13/64'',1/4''16pcs hinge drill (black)Specifications: 5/64'',7/64'',9/64'',9/64'',11/64'',5'',13/64'',1/4''One for each corresponding twist drillHole Size5/64'': The diameter of the hole is about 2mm, using about 2.2-2.8mm self-tapping screws7/64'': The diameter of the hole is about 2.8mm, using about 3-3.5mm self-tapping screws9/64'': The diameter of the hole is about 3.5mm, using about 4-4.5mm self-tapping screws11/64'': The diameter of the hole is about 4.5mm, using about 5-5.5mm self-tapping screws5'': The diameter of the hole is about 5mm, using about 5.5-6mm self-tapping screws13/64'': The diameter of the hole is about 5.1mm, using about 5.6-6.1mm self-tapping screws1/4'': The diameter of the hole is about 6.3mm, using about 6.8-7.3mm self-tapping screwsWhen making holes, please adjust appropriately according to the hardness of the wood. If the wood is soft, you can choose a smaller one, if the wood is hard, you can choose a corresponding or larger oneAccurate positioning, will not shift, sawdust will be automatically discharged from the holes on both sides of the drill, will not jam the drill, a must for professionals and DIYers