ProFit Center Drill Multi-Purpose 16-30 mm DDH1MP. Patented Click & Drill® system. For multi-purpose hole saws ranging from 16-30 mm. Hexagonal 8 mm shank with HSS drill for use in wood and plastic. Suitable for multi-purpose hole saws with a drilling depth of 52 mm. For larger diameters (from 76 mm), the Heavy Duty center drill is recommended, which is more resistant to heavier loads. Size DDH1... (Hex 8 mm) for saws from 16-30 mm. Size DDH2... (Hex 10 mm) for saws = 32 mm. HSS drill for use in wood, particle board, MDF, and soft plastics. HM drill (with carbide tip) for use in stone, etc.