6pcs tap set: M3*0.5, M4*0.7, M5*0.8, M6*1.0, M8*1.25, M10*1.5, the scale is clear and easy to access. High-speed steel tap drill with surface blue coating, high hardness, wear-resistant and durable, not easy to rust. Universal hexagonal handle, 1/4 inch standard handle, non-slip design, easy to replace, suitable for most electric drills, bench drills, tapping machines. Tapping drills are designed with inclined tips and helical grooves to facilitate the positioning and countersinking of drill holes while completing the thread cutting task and optimizing the efficiency of tapping. Widely used in drilling, tapping, deburring and other repair tasks on plastic, PVC, fiberboard, wood, copper, brass, aluminum and other soft and thin sheet metal. Specifications: Quantity: 6 pcs Size: M3*0.5、M4*0.7、M5*0.8、M6*1.0、M8*1.25、M10*1.5 Material: High Speed Steel Shank Diameter: 6.35mm(1/4") Color: Blue