Bi-Metal M3 Hole Saw remove material only from the edge of the hole, cutting out an intact disc of material, unlike many drills which remove all material in the interior of the hole. They can be used to make large holes in wood, sheet metal and other materials,that diameter range from 14mm to 200mm
Adjustable Arbor For Hole Saw
3/8" hex shank,with 5/8" -18UNF thread.
fitting hole saw diameter 1-1/4" to 8-17/64" (32mm to 210mm)