Bosch Hole Saw HB500 5 Inch Bi Metal M42 Cobalt Progressor Tooth Cutter (5 TPI Geometry Wood Stainless Metal Plumbing Mechanical Installation Tool) Skid Steers this heavy duty side cutter incorporates this heavy duty side cutter incorporates luminescent handles that automatically recharge under natural or artificial lighting to stay highly visible inside deep attics or unlit basements Metal Electrical Enclosure Threading: Drilling pilot holes and cutting clean #6 32 through 1 4" 20 internal machine screw threads in junction boxes and conduit fittings Heavy Duty 5 Inch M42 Cobalt Alloy Bi Metal Hole Saw with Specialized Progressor Tooth Configuration and Reinforced Base Shoulder Shielding Letting the progressive teeth slice smoothly at a balanced velocity checks dynamic edge glazing and guarantees optimal chip removal tracking pathways