Four multi-purpose blades which can be locked in position when in use, with a choice of 25, 40 & 50mm quick change shafts. Black passivated curved blade in high-carbon chromium steel (SUJ2) for use on steel, aluminium & hard plastics. Brown passivated curved blade in HSS steel for use on brass, cast iron & stainless steel. Straight blade in high-carbon chromium steel (SUJ2) for use on steel, aluminium & hard plastics. Crankshaft 90 degree countersink for holes 1mm - 10.4mm diameter.