Carbide Teeth For Longer Life & Smooth Cuts in Stainless and Other Hard Metals;Stop shoulder Design Prevents Over-Drilling, limiting cuts to 3/16" Depth;3 Flat Secure Grip Shank, Optimized for Drill/Drivers;Spring Loaded Pilot Bit For Fast drilling & Clean Plug Ejection;One-Piece Design For Added Durability;Up to 10X Life Vs Standard Hole Saws;For Use With Drill/Drivers;Includes: 7/8", 1-1/8", 1-3/8" Cutters, Hex Key, and One Additional Pilot Bit;For Use In Stainless Steel, Mild Steel, Copper, Aluminum, and Other Metal Materials