The SITEH3RO Ultimate Kit is the ideal solution for all common handheld metalworking projects, including; taps, step reamers, car reamers and step drills in a range of common sizes. Designed with our specialist SITEH3RO coating, these tools are tested to provide 75% better life than uncoated tools due to a reduction in heat generation during cutting. Includes: 3 Step Drills (4-12mm, 4-20mm, 4-30mm), 3 Step Reamers (8-16mm, 14-22mm, 20-28mm), 4 Taps (M6, M8, M10, M12), 3 Car Reamers (14mm, 18mm, 22mm) and 2 SITEH3RO Holders (1/2" and 3/4"). Features Make new holes with Step Drills & Step Reamers Expand holes with Step Drills and Step & Car Reamers Align holes with Car Reamers 75% longer life with SITEH3RO coating Specification Diameter: 3 Step Drills 4-12mm / 4-20mm / 4-30mm, 3 Step Reamers 8-16mm / 14-22mm / 20-28mm, 3 Taps M6, M8, M10 & M12, 4 Car Reamers 14mm / 18mm & 22mm, 3 Holders 1/2" & 3/4" 2 Use: Expanding and Aligning holes, Expending Holes and Drilling new holes, Thread Holes, Drilling Material: HSS M2 Standard Equipment 3x Step Drills (4-12mm, 4-20mm, 4-30mm) 3x Step Reamers (8-16mm, 14-22mm, 20-28mm) 4x Taps (M6, M8, M10, M12) 3x Car Reamers (14mm, 18mm, 22mm) 2x SITEH3RO Holders (1/2" and 3/4")