Available in 3 styles: Metric Titanium and SAE Diamond Metric Titanium; SAE Metric Blue Plated; and SAE Titanium Self Selecting. Made from high speed steel with a titanium alloy surface treatment to deliver fast cutting, preserved strength, and efficient performance. Sizes - Metric: M3x0.5, M4x0.7, M5x0.8, M6x1, M8x1.25, M10x1.5 - SAE: 1/4-20 NC, 12-24 NC, 10-24 NC, 10-32 NC, 8-32 NC, 6-32 NC Shank design and drilling control - Hex shank ends are tapered to reduce excessive knocking and cam-out - The back taper exceeds the tap to prevent over drilling and damage to threads Use scenarios - Drilling pilot holes in metal workpieces or machine frames to ensure clean threads and accurate hole sizes before tapping - Automotive repair and maintenance tasks that involve standard SAE and metric bolt sizes - Fabrication or DIY metalworking on aluminum or steel parts requiring precise hole diameters with controlled depth