Feature:1. Surface Coating: The milling cutter has a spray paint coating, which is beautiful and rust proof, with super wear resistance, strong texture and corrosion resistance.2. Incisive Blade: This milling cutter has super performance, incisive blade, strong and durable, burr free surface, accurate accuracy and stable cutting.3. Frame Molding Bit: This router bit is suitable for trimming and chamfering of all kinds of wood, making your work easier and more accurate.4. Cemented Carbide: This milling head is made of cemented carbide material, which is harder, less deformable, more durable and wear resistant.5. Main Application: The router bit is used for woodworking grooving or other woodworking such as door frames, baseboards, etc.Specification:Item Type: Woodworking Keyhole Router BitMaterial: Cemented CarbideSpecifications: Set of 3 lock hole knife 1/4 shank black Size: Approx. 1-13/16 x 1/4in / 4.6 x 0.64cmCutter Head Size: Approx. 7/16 x 5/16in / 1.11 x 0.79cm, Approx. 7/16 x 3/8in / 1.11 x 0.95cm, Approx. 7/16 x 1/2in / 1.11 x 1.27cmBlade Size: 5/16in, 3/8in: Approx. 3/16in / 0.48cm, Approx. 1/16in / 0.16cm1/2in: Approx. 1/4in / 0.64cm, Approx. 1/8in / 0.32cmUse: Woodworking milling cutter.Package List:1 x 5/16in Keyhole Router Bit1 x 3/8in Keyhole Router Bit 1 x 1/2in Keyhole Router Bit