Drillco's line of carbide tipped hole cutters are ideal for drilling large diameter holes in both ferrous and non-ferrous materials. The 9500CT is ideal for thinner material up to 3/16" thick such as sheet metal, steel, aluminum, copper, plastics, cast iron, and the difficult to machine stainless steel. Drillco's TCT Hole Cutters are an excellent performing, cost effective alternative to bi-metal hole saws. Their portability makes them ideal for a wide range of professionals including electricians, plumbers, HVAC technicians, mechanics, general contractors, installers, DIY'ers and more. Diameters 9/16" to 2.5/8" have a 3/8" shank; 2.11/16" to 4" have a 1/2" shank. Tungsten carbide teeth are made in Germany using premium grade carbide. These ultra-hard teeth increase performance and tool life.