Bosch hole saw hss co sets for metal with power change adaptor bosch 2608580089 this bosch sheet metal holesaw set contains 6 x holesaws 1 x power change adaptor 2 x hss co pilot drill bits in a sturdy carrying case the saws have an ejector spring to aid the removal of cut material bosch 2608580089 hole saw hss co set 20 to 64mm 6 piece metal with power change