This Lenox 3006868L is a 4-1/4" 1-piece Bi-Metal Speed Slot Hole Saw. Designed with a thin kerf and an enhanced tooth geometry, this hole saw will retain its efficiency and sharpness, cut after cut. For easy plug removal, a staircase pattern is featured on this speed slot cutting tool. When talking of durability, this speed slot hole saw is made with bimetal construction that prevents it from breaking while cutting through wooden materials/pieces. This hole saw is one of Lenox's reliable tools that can give you the convenience you need without spending a lot of money and effort.