Precision Twist Drill C21R10COSET 099701 21-piece HSS-E cobalt jobber drill set with 135° split point, ANSI standard, right-hand cut. Usable length 4". Cobalt high speed steel construction for heat resistance and extended tool life in tough materials.

The C21R10CO drill set contains R10CO drills which are designed with heavy duty in mind, so recommended for drilling in difficult materials and applications. They are manufactured from High Speed cobalt and therefore used for drilling hard materials including tool steels. They have a 135 split point which is a great help with self-centering the drill for easy location and rounder holes, and also reduces the push force required.

With a bronze oxide finish to prevent workpiece material from sticking to the cutting surfaces, you can be sure of clean and accurate results.

The C21R10CO drill set comes with 21 different fractional sized R10CO drills from 1/16” to 3/8” in 1/64” increments.