SANDFLEX® bi-metal holesaw set containing popular sizes for the engineering, water, sanitation and electrical installation industries. The holesaws work excellently in most materials, such as wood, plastics, non ferrous and ferrous steel including stainless steel. Their knockout holes allow easy removal of cores. Holesaws: 1 of each of 16mm (5/8in), 20mm (25/32in), 25mm (2in), 32mm (1.1/4in), 40mm (1.9/16in) and 51mm (2in).Arbors: 3834-ARBR-1130 - for holesaws 14-30mm, 3834-ARBR-11152 - for holesaws 32-210 mm.Also includes a pilot drill, hexagon key and chip brush.