The Starrett KFC06023 General Purpose Holesaw Kit contains a selection of sizes to cover a variety of different jobs Fast Cut Bi-Metal Holesaws provide a smoother faster cut on a wide range of materials when compared to the previous constant pitch saw Improved tooth material and 55 TPI25mm tooth form for enhanced heat and wear resistance and greater product life Specifically suited to cutting stainless and mild steel sheet they will also cut through tubes with a wall thickness of up to 3mm 18in Suitable for all tradesmen installation engineers industry generally and the DIY enthusiast Packed in a sturdy EVA carry case Contains 6 x Holesaws 22 29 35 44 51 64mm 2 x Arbors A1 A10