ST-HS A1E 300mm Hole Saw Extension Bar

M3 bi-metal hole saw from the SiteTuff ST-HS range. Variable 4/6 TPI pitch teeth cut quickly and clear swarf well through both thin and thick gauge material, and the bi-metal construction resists the heat build-up that shortens blade life. Cutting diameter nan with a 38mm depth of cut. Cuts steel, cast iron, aluminium, brass, copper and other non-ferrous metals, plus plywood, chipboard, MDF, plasterboard, plastics and fibreglass. Requires an A1 arbor for sizes up to 30mm or an A2 arbor above 32mm. Use a cutting fluid on metal and let the saw cool between holes.