Features Rip Guard - each tooth is built with more steel behind the cutting edge for added strength. Includes Plug Jack, an all access slot design for fast plug removal. The Plug Jack gives access lower into the cup for thick material and higher towards the teeth for thin material increasing productivity and eliminating downtime between holes. Bi-metal construction with 8% cobalt for increased wear resistance. For tool-free change-outs, use universal Quick-Change arbors. For use with steel, non-ferrous metals, wood, plastic. Includes nine holes saws - 3/4", 7/8", 1-1/8", 1-3/8", 1-1/2", 1-3/4", 2", 2-1/8", 2-1/2", (1) 3/8" small thread arbor, (1) 3/8" large thread quick change arbor, and (2) 1/4" x 3-1/2" high speed steel pilot bits. No. 49-22-4025: Material: Bi-Metal, Pieces In Set: 13 Pcs., Pkg Qty: 1, Package Type: Box