UN100-025 | Holemaker Bi-Metal Holesaw 25mm Dia.PREMIUM QUALITY BI-METAL M42 COBALT HIGH SPEED STEEL.Suitable for drilling a wide range of materials includingsteel aluminium brass cast iron plastics & wood. The M42(8% Cobalt) high speed steel teeth offer optimal cuttinglife & performance.VARIABLE PITCH 4 / 6 TEETH PER INCH.For reduced vibration delivering increased life performance& accuracy. Diameter: 25mm (1 ) Thread: 1/2