Specifications:This product is suitable for rapid drilling and tapping processing.It is recommended to use it on a tapping machine, and pay attention to the operation method when using the electric drill, and excessive shaking and tilting will affect the tapping and even break the tap.Suitable for soft metals such as aluminum alloy, tin alloy, copper parts, and the recommended thickness is less than 5mm. Item Name: Drill BitMaterial: High Speed Steel (HSS) 6542Feature: Durable, Rust Resistant, Wide Application, Hardware ToolSize: Shank: 1/4", Hex Handle Diameter: 6.35mm/0.25" (Approx.)Model: M3: Length: 53mm, Drill Diameter: 3mm, Thread Interval: 0.5mm/0.020" (Approx.)M4: Length: 53mm, Drill Diameter: 4mm, Thread Interval: 0.7mm/0.028" (Approx.)M5: Length: 56mm, Drill Diameter: 5mm, Thread Interval: 0.8mm/0.031" (Approx.)M6: Length: 56mm, Drill Diameter: 6mm, Thread Interval: 1.0mm/0.039" (Approx.)M8: Length: 58mm, Drill Diameter: 8mm, Thread Interval: 1.25mm/0.049" (Approx.)M10: Length: 59mm, Drill Diameter: 10mm, Thread Interval: 1.5mm/0.059" (Approx.) Notes:Due to the light and screen setting difference, the items color may be slightly different from the pictures.Please allow slight dimension difference due to different manual measurement. Package Includes:1 x Drill Bit