This general purpose holesaw sets contains the six most frequently used holesaw sizes along with two arbors and an adaptor supplied in sturdy zip up storage case for safe and secure storage these high speed steel bi metal saws may be used on a wide variety of materials including wood chipboard plywoods plasterboard non laminated tops this set contains6 x hss bi metal holesaws 19 22 29 38 44 57mm2 x hexagon arbors 38in 716in1 x arbor adaptor1 x zip up storage case