9Piece Bi-Metal Hole Saw Set 9Piece Bi-Metal Hole Saw Set Thin sheet hole saws: HSS-M3 Bi-metal; Max cut depth: 35mm 6pcs Bi-metal hole saws: 7/8" (22mm), 1-7/64" (28mm), 1-3/8" (35mm), 1-3/4" (44mm), 2-5/8" (67mm), 2-7/8" (73mm) 2pcs Arbors: [1pc 1/4" round shank adapter with HSS pilot drill for 14-30mm hole saw; 1pc 7/16" Hex shank adapter with HSS pilot drill for 32-152mm hole saw 1pc Adapter: 1/2"-20 UNF-5/8" -18UNF