HSS set of 8, with M3-M12 taps and 1/16"-1/2" wrench handle for woodworking/machine repair Set of 8 HSS tapping tools, with M3-M12 taps and 1/16"-1/2" Wrench Handle for Woodworking/Machine Repair With high-speed steel design for high wear resistance and heat resistance, which is durable and has long service life The thread pitch of the straight knurled tap is: M3 * 0.5 , M4 * 0.7, M5 * 0.8, M6 * 1.0, M8 * 1.25, M10 * 1.5, M12 * 1.75. You can use to control different wires Multi-layer optical elements ensure excellent light transmission and brightness, high product safety and high speed The handle of the socket wrench can be divided into two segments, can be fixed firmly on the screwdriver, remove screws, bolts, etc. Ideal for auto repair and machines where metric threads are specified, allows you to remove broken screws or bolts. Suitable for bicycle repair, furniture assembly, machine manufacturing, etc.