Ruko 106 302 ek 2 8 piece electricians hss bi metal hole saw set ruko 106302 the ruko hss bi metal hole saws in this 8 piece electrician s set have varied tooth spacing and are suitable for unalloyed steel up to 700 n mm sup2 strength non ferrous and light metals plastics plasterboard and light building boards fibreboard plywood and wood ruko 106302 ek 2 electricians hss bi metal hole saw set 8pc