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Features:Specifications:Material:Quality Carbon SteelAngle: 90 DegreeCommonly used sizes include 3 sizes(12mm, 16mm, 19mm).Handle: 6.35mm(1/4inch) Hex Shank HandleCounterbore diameter: 12mm(1/2inch) / 16mm(5/8inch) / 19mm(3/4inch)Ideal for wood planks, fibrous sheets, particleboard, plywood, plastic, aluminum panels, etc. to form holesFit for 90-degree holes in wood and soft metals in the preparation of countersunk screws and fastenersLowering and deburring without proper chatter for DIY, home, and general construction developmentPlease Pay Attention to:The most important thing to remember when using counterbores is to make the size correctly match the screws used.For the sake of safety, when use, please do NOT use it for high-hardness metals.