High speed steel Bi-metal Hole Saws are rugged cutting tools designed to cut accurate holes in machinable materials up to 1-3/8'', 35mm thick. Ranging in size form 9/16",14mm to 6'',152mm in diameter, they can be uses in portable electric, air tools, drill presses, lathes, boring mills, milling machines or any other machine which has a rotating spindle. Hole Saws have 4/6 vari-pitch tooth design and are recommended for cutting steel and cast iron pipe, steel plates, aluminium, copper, brass, stainless steel, wood and plastics,Furnished in standard size as listed and in handy assortments.