Irwin 1 In. Black Oxide Silver & Deming Drill Bit Category_Home Safety & Security for insulated ceilings & direct

for insulated ceilings & direct contact with insulation

Rockwell C42 hardness

Works in heavy weed conditions

Fits The Following

arctic rated for - 40 degrees Fahrenheit Celsius

Irwin 1 In. Black Oxide Silver & Deming Drill Bit Category_Home Safety & Security for insulated ceilings & direct135 deg. split point for no slip starting on hard materials. Parabolic flute design for improved heat dissipation and increased life. Industrial M7 grade steel for high performance drilling in metal, wood, and plastic. Black oxide coated for longer life and greater resistance to wear. Jobbers length. For drilling through metal, wood, fiberglass, stainless steel.