Hole saw kit M3 or M42 Bi-metal Hole Saw, Plumber's Kit, Sharp and long-lasting tools Hole saw kit ( Bi-metal Hole Saw Plumber's Kit )M3 or M42 Bi-metal Hole Saw KitIncludes: 19mm, 22mm, 29mm, 38mm, 44mm, 57mm hole saws3/8" Hex, 7/16" Hex and Mandrel adapterAluminum display case Sizes in inch are also available.