Hole saws are suitable for wood, thin sheet alloy and thin sheet metal. Includes: Bi-metal hole saw 3/4 in (19mm), 7/8 in (22mm), 1-1/8 in (29mm), 1-1/2 in (38mm), 1-3/4 in (44mm), 2-1/4 in (57mm). 38 in Hex shank adapter with HSS pilot drill for 14-30mm hole saw. 7/16 in Hex shank adapter with Hess pilot drill for 32-210mm hole saw. 1pc adapter.