The Lenox Tools 25476301G High Speed One Tooth Rough Wood 7 Piece Hole Cutter Kit is designed to work fast and last long. This set contains three hole cutters that have 2-1/8-Inch, 2-9/16-Inch and 3-5/8-Inch diameters, as well as the 2L arbor, diamond file and two stubby 3/8-Inch pilot bits. The cutting teeth are made of high speed steel and are resharpenable using the Lenox Diamond file. These hole cutters are made to run at high speeds with very little torque. These hole cutters are very durable wood cutting tools that can work in wet, frozen, pressure treated and hard woods without binding. The patented design with large ejection gullet allows for easy plug removal. This unique design also allows you to cut at an angle allowing you to feed piping in different directions. These hole cutters work with a standard arbor, they work best with the Lenox 2L and 2L Snap Back Arbors. The ideal pilot bit for these hole cutters is a 3/8-Inch Stubby spade bit, but a traditional split point pilot bit will also do the trick.