The Starrett KDC05021 Electricians Holesaw Kit contains a selection of sizes to cover a variety of different jobs Deep Cut Bi-Metal Holesaws offer aggressive material penetration and kerf clearance Improved tooth material for enhanced heat and wear resistance and greater product life Ideal for solid materials or tubes with a wall thickness greater than 3mm The 51mm cutting depth improves cutting performance on tubes particularly where there is a need to cut through both sides of the tube Suitable for all tradesmen installation engineers industry generally and the DIY enthusiast Packed in a sturdy EVA carry case Contains 5 x Holesaws 20 25 29 44 51mm 2 x Arbors A1 A10