Bosch hole saw hss co sets for metal with power change adaptor bosch 2608584812 this bosch electricians hole saw set sheet metal has 6 x hole saws 1 x power change arbor and 2 x centre drills the saws have an ejector spring to aid the removal of cut material bosch 2608584812 hole saw hss co set 22 to 64mm 6 piece metal with power change