WORKPRO 9Pcs Bi Metal Hole Saw Hole Saw Kit 19-57 mm Aluminum Storage Case
Accessories Specification: The kit includes 2 1/4" center drills (80 mm, HSS M2), a 3/8" hex shank drill for 14-30 mm hole saws, and a 7/16" hex shank drill for 32-152 mm hole saws. One drill fits an adapter for sizes over 32 mm.