The Bi-Metal holesaw range have a vari-pitch tooth design and are recommended for cutting steel, aluminium, copper, brass, wood and plastic Features Application: Trunking, conduit, pipe, kitchen, bathroom Hardwood, Softwood, Metal, Mild Steel, Aluminium, PVC. Star rating: *** Aluminium case Kit Contains: Sizes 6, 19, 22, 25, 32, 35, 37, 44, 51, 57, 64, 68, 76mm, x2 arbor and x1 spring.