High speed steel , Bi metal ,Variable pitch tooth Plumbers
holeaw kit containing one of each ,

19mm , 22mm , 29mm , 38mm , 44mm , and 57mm Holesaws

1 x 3/8in Hexagon arbor

1 x 7/16in Hexagon arbor

1 x Arbor adaptor

Supplied in a sturdy Aluminium case.