Item Type: Combination Drill TapMaterial: High Speed SteelSurface Treatment: Surface Plating Treatment Metric Specifications: M3x0.5, M4x0.7, M5x0.8, M6x1, M8x1.25, M10x1.5Imperial Specifications: 1/4-20NC, 12-24NC, 10-24NC, 10-32NC, 8-32NC, 6-32NCHex Shank Diameter: 1/4inExtension Rod: Length Approx. 60mm / 2.36in, Shank Diameter 1/4inPackage List:12 x Plated Tap 1 x Extension Rod1 x Plastic BoxNote:Confirm the appropriate size before use, and do a good job of safety protection during use