UN108-160 | Holemaker 16pc Cobalt Holesaw Set - Plumbers PREMIUM QUALITY BI-METAL M42 COBALT HIGH SPEED STEEL. Suitable for drilling a wide range of materials including steel aluminium brass cast iron plastics & wood. The M42 (8% Cobalt) high speed steel teeth offer optimal cutting life & performance. VARIABLE PITCH 4 / 6 TEETH PER INCH. For reduced vibration delivering increased life performance & accuracy. 16 Piece Set Includes: 1 x UN100-016 - 16mm (5/8 ) 1 x UN100-019 - 19mm (3/4 ) 1 x UN100-022 - 22mm (7/8 ) 1 x UN100-025 - 25mm (1 ) 1 x UN100-030 - 30mm (1-3/16 ) 1 x UN100-035 - 35mm (1-3/8 ) 1 x UN100-044 - 44mm (1-3/4 ) 1 x UN100-051 - 51mm (2 ) 1 x UN100-057 - 57mm (2-1/4 ) 1 x UN100-073 - 73mm (2-7/8 ) 1 x UN100-092 - 92mm (3-5/8 ) 1 x UN100-114 - 114mm (4-1/2 ) 1 x UN102-125 - 11/32 Arbor 1 x UN102-140 - 7/16 Arbor 1 x UN102-145 - Arbor Thread Adaptor 1 x UN102-100 - 12 Extention Bar