Specifications:Suitable for fast drilling, tapping.Recommended for use on tapping machine, pay attention when using hand drills.Excessive shaking and tapping will affect the tilt, and even broken tap.Item Name: Screw Spiral TapMaterial: HSSQuantity: 6Pcs in 1SetThread: 1/8"(3.175mm), 5/32"(3.97mm), 3/16"(4.76mm), 1/4"(6.35mm), 5/16"(7.94mm), 3/8"(9.53mm)Size: Total length: 58mm/2.28", Blade Length: 28mm/1.1", Shank Length: 30mm/1.18", Shank Diameter: 6.35mm/0.25" (Approx.)Notes:Due to the light and screen setting difference, the item& 39;s color may be slightly different from the pictures.Please allow slight dimension difference due to different manual measurement.Package Includes:1 Set of Screw Spiral Tap(Total 6Pcs)