The Bi-Metal holesaw range have a vari-pitch tooth design and are recommended for cutting steel, aluminium, copper, brass, wood and plastic. Kit contains 20, 25, 32 and 35mm bits + 1 arbor. Fast cutting and long life. Sizes carefully selected for the professional plumber. Features: Bi-metal holesaws with variable tooth pitch. Plastic case. Fast cutting and long life. Options Include: D-17192PILOT DRILL 71MM CENTERING BIT D-17619SDS PLUS SHANK ADAPTER 30-152 D-17186HEX SHANK 11MM ADAPTER 30-152 D-17603SDS PLUS SHANK ADAPTER 16-29 D-17603SDS PLUS SHANK ADAPTER 16-29 D-17170HEX SHANK 9.5MM ADAPTER 16-29 D-17170HEX SHANK 9.5MM ADAPTER 16-29 D-16994HOLE SAW 16mm BiM D-17005HOLE SAW 19mm BiM D-17251HOLE SAW 20mm BiM D-17011HOLE SAW 22mm BiM D-17027HOLE SAW 24mm .