The starrett kfc06071 bi metal fast cut ulti mate electricians holesaw kit is suitable for all tradesmen installation engineers industry generally and the diy enthusiast starrett kits feature a range of saws with sizes selected specifically to suit the relevant application packed in a sturdy eva carrying case these kits will be an invaluable addition to any toolbox contains 6 x bi metal fastcut holesaws 16 20 25 32 40 51mm1 x arbor a3 ulti mate arbor6 x ulti mate arbor adaptors