Bi-metal hole saw 20 mm

Bi-metal hole saw 20 mm, height 51 mm, drilling depth 38 mm, suitable for metal, steel/Inox, cast iron, brass, aluminum, wood, thread: 1/2” x 20 UNF, made of HSS high-speed steel, for use with 56T753 pilot drill adapter for bi-metal hole saws 14-30 mm, Hex, diameter: 20 mm, max rotation speed: steel: 445 rpm, stainless steel: 220 rpm, aluminum: 660 rpm, wood: 520 rpm, cast iron: 290 rpm, brass: 580 rpm