1/4" Cobalt Steel Drill Bits | Jobber | Length | 12-Pack length-4-25-4-1-4 The nut design also covers

The nut design also covers a greater surface area

Zirconia grain outlasts aluminum oxide up to 3 to 1

Available in a variety of diameters and grit sizes so you can fine tune your product selection to your exact application

Embedment (in): 2-3/4

Removal of rust

1/4" Cobalt Steel Drill Bits | Jobber | Length | 12-Pack length-4-25-4-1-4 The nut design also coversHeavy duty web construction designed to outperform and outlast. Manufactured from heat resistant premium Cobalt high speed steel. Cobalt drills can maintain their cutting ability at high temperatures and are extremely resistant. 135 split point design for more rugged and efficient drilling. Made from M42 Cobalt High Speed Steel for excellent wear resistance on high strength materials. For drilling in medium alloyed steel, stainless steel, hardened