UN108-100 | Holemaker 16pc Bi-Metal Holesaw Set – General 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 UN100-032 – 32mm (1-1/4 ) 1 x UN100-035 – 35mm (1-3/8 ) 1 x UN100-038 – 38mm (1-1/2 ) 1 x UN100-044 – 44mm (1-3/4 ) 1 x UN100-051 – 51mm (2 ) 1 x UN100-057 – 57mm (2-1/4 ) 1 x UN100-064 – 64mm (2-1/2 ) 1 x UN100-076 – 76mm (3 ) 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 Extension Bar