UN108-120 | Holemaker 9pc Cobalt Holesaw Set – Electricians 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. 9 Piece Set Includes: 1 x UN100-016 – 16mm (5/8 ) 1 x UN100-020 – 20mm 1 x UN100-025 – 25mm (1 ) 1 x UN100-032 – 32mm (1-1/4 ) 1 x UN100-040 – 40mm (1-9/16 ) 1 x UN100-051 – 51mm (2 ) 1 x UN102-125 – 11/32 Arbor 1 x UN102-140 – 7/16 Arbor 1 x UN102-145 – Arbor Thread Adaptor