Extra Hard Drills
- Extra Hard Drills
- Fractional Sizes from 1/8" to 1/2" Click box above to view all sizes and prices
- Great for Extra Hardened Steel
- High Alloy Body
- Specially Tempered
- Carbide Tipped
These industrial duty bits were developed to penetrate extra hardened steels such as might be encountered in the locksmith trade. A specially tempered body matched with a carbide tip made from an exotic grade of carbide enables these bits to penetrate hard steels up to 65 Rockwell C. When using these bits it is recommended that you use coolant when possible and clear the drill from the hole occasionally. Do not use these bits for drilling in non-ferrous metals, concrete or masonry.