The starrett kdc05021 deep cut bi metal 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 5 x holesaws 20 25 29 44 51mm2 x arbors a1 and a10