Description of Irwin Tools 4935106 32 Inch Material
Durable carbide tipped construction. Brazed carbide tip has a unique diamond ground 4-face design for excellent centered starts with little walking and best hole quality. Double ground flute ensures fast and efficient removal of the drilling dust and prevents clogging. Special duo tone surface finish reduces friction and resistance, increasing bit life and drill battery life. Special Grind Angle creates sharper tip edges for Fast starts in tough materials.
Bought one of these. The drill broke the first time it was used at low speed. replacement ordered. Didn't last long. I ended up buying metal drill bits from NAPA Auto Parts for $2.99 each, which last MUCH, MUCH longer and do the job well.