Toolshed BiMetal Holesaw. Another quality product from The Toolshed at a very low price! Direct out of the same factory as the manufacturer of a very well-known respected brand name. Manufactured using HSS BiMetal teeth makes these hole saws particularly good for cutting holes in metal, cast iron, plastic etc.. but will also cut aluminum, composite board, fiberglass, timber etc.. Works with ToolShed and other well known brand mandrels eg. Blu-Mol Starrett, Morse etc.. Specifications. Max Depth - 35mm. Mandrel Size - 1/4" round shank