This is a 4-1/4" (108mm) Bi-Metal Hole Saw. This Hole Saw is Brand New in BULK Packaging. Features & Benefits: *1-7/8" (48 mm) Cutting Depth Cuts Though 2 x 4 In A Single Pass. *Cobalt Steel Lasts 20% Longer Than Hogh Speed Steel *Cats Eye Opening *Fleem Ground Teeth Application Information: *Create Holes For Pipe and Tubing Installations, Door Lock Installations, Electrical Conduit, Hoses, and Antennas. *Ideal for Plumbing, Construction, Aircraft, Electrical, Maintenance, and Automotive Applications. *Use in Steel, Aluminum, Brass, Cast Iron, Plastic, or Wood. This Hole Saw to be Used With a 1/2 - 20 Thread Arbor. They Are Located in the Arbors & Pilots Sections of Our Store.