UN108-110 | Unikut 7pc Bi-Metal Holesaw Set – Handyman 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. 7 Piece Set Includes: 1 x UN100-022 – 22mm (7/8 ) 1 x UN100-025 – 25mm (1 ) 1 x UN100-029 – 29mm (1-1/8 ) 1 x UN100-032 – 32mm (1-1/4 ) 1 x UN100-038 – 38mm (1-1/2 ) 1 x UN102-125 – 11/32 Arbor 1 x UN102-145 – Arbor Thread Adaptor