The Halls MC High-Speed Steel Step Drill Bit in the 20mm - 30mm size range is designed for larger diameter hole applications in sheet metal fabrication. This variant covers eleven consecutive sizes—20, 21, 22, 23, 24, 25, 26, 27, 28, 29, and 30mm—making it essential for HVAC work, larger cable entries, and ventilation installations. With a robust 13mm shank providing secure chuck grip and reduced flex during operation, this step drill handles the demands of larger hole cutting with confidence. The 1mm increments throughout the range allow for precise sizing of holes for specific fittings, flanges, and mounting hardware commonly found in commercial and industrial applications. Rated for sheet metal up to 4mm thick, this bit produces clean, burr-free holes that often require minimal finishing. When drilling metals, use a coolant to maintain cutting efficiency and prolong tool life, particularly important with these larger diameter cuts. Features and Benefits: • Eleven sizes from 20mm to 30mm for larger holes • 13mm shank for maximum rigidity and grip • Maximum material thickness: 4mm sheet metal • 1mm increments for precise hole sizing • Ideal for HVAC and large cable entry work Specifications: Min. Size (mm): 20 Max. Size (mm): 30 No. Steps: 11
