Bi-metal hole saws 19-68 mm, set of 7 pcs.

Bi-metal Hole Saws 19 mm, 29 mm, 33 mm, 51 mm, 68 mm, Adapter 3/8 and 7/16 Hex, Application: Metal, Steel/Inox, Cast Iron, Brass, Aluminum, Wood.
19 and 29 mm: thread 1/2” x 20 UNF
33, 51, and 68 mm: thread 5/8” x 18 UNF
Drilling depth: 38 mm
Height 51 mm for diameters 19, 29, 33 mm
Height 44 mm for diameters 51, 68 mm
Made of HSS high-speed steel
Set of 7 pcs
Max rotational speed for 19 mm: steel 460 rpm, stainless steel 230 rpm, aluminum 690 rpm, wood 680 rpm, cast iron 300 rpm, brass 600 rpm
Max rotational speed for 29 mm: steel 300 rpm, stainless steel 150 rpm, aluminum 450 rpm, wood 450 rpm, cast iron 200 rpm, brass 400 rpm
Max rotational speed for 33 mm: steel 260 rpm, stainless steel 135 rpm, aluminum 390 rpm, wood 390 rpm, cast iron 175 rpm, brass 345 rpm
Max rotational speed for 51 mm: steel 170 rpm, stainless steel 85 rpm, aluminum 255 rpm, wood 200 rpm, cast iron 115 rpm, brass 230 rpm
Max rotational speed for 68 mm: steel 130 rpm, stainless steel 65 rpm, aluminum 190 rpm, wood 165 rpm, cast iron 85 rpm, brass 165 rpm