Lenox 30022-22L Bi-Metal Hole Saw 1-3/8"Lenox strives to maximize quality in every step of their operations for the long-term benefit of their customers. No matter where you are, you can depend on Lenox quality.Lenox 30022-22L Bi-Metal Hole Saw 1-3/8" Features:; Added durability: Thick backing plate resists damage andincreases life.; Unique tooth configuration patented VARI-TOOTH; design optimizes cutting for fast cuts and long tool life.; Resists tooth strippage: Bi-metal construction creates a hardened edge to minimize tooth stripping.; Use standard arbor; Electron beam welded ; M-2 high speed steel ; Cutting edge Rc 63-65, vari-tooth design ; Spring steel back, positive rake tooth ; Bi-metal means high speed steel teeth welded to a "spring" steel back Lenox 30022-22L Bi-Metal Hole Saw 1-3/8" Specifications:; Diameter: 1 3/8"; Cutting Depth: 1 1/2"