Artu Usa 01170 Multi Purpose Drill Bit, 1/2" x 16" Professional External collar for use with

External collar for use with standard pneumatic hammers

battery chargers

Ultra-compact

Stain-resistant

Pkg Size=25-lb

Artu Usa 01170 Multi Purpose Drill Bit, 1/2" x 16" Professional External collar for use withFor rotary and percussion drilling. Chrome vanadium steel shank with cobalt and tungsten carbide tip for increased strength and extra hardness. Special negative back grinding enables tip to bore through steel, wood, tile, marble, porcelain, glass, concrete, plastic and cast iron with a filing action rather than a cutting action. No center punch required, eliminates walking. Withstands temperatures up to 1900 degrees Fahrenheit. Easy to resharpen. For