Bi-Metal Hole Saw 20 mm

A bi-metal hole saw cup, 20 mm in diameter with a 28.5 mm cutting depth, for cutting clean round holes in wood, plastics, thin sheet and some metals when fitted to an arbor and drill. The variable-pitch teeth cut smoothly with less noise, and clear chips better, according to the maker. It is sold as a single cup, so a matching arbor with a pilot drill has to be bought separately.