Hertel 66693714 Cobalt Jobber Drill Bit Set 21 Pc

Product Description

The HERTEL 66693714 is a 21-piece cobalt jobber length drill bit set designed for heavy-duty metalworking applications. Each bit features a 135-degree split point for fast, accurate starting without a center punch. The straight shank design is compatible with standard drill chucks. Bits are left in a bright, uncoated finish, which is typical for cobalt grades where coating adhesion is unnecessary and base material hardness does the work. Step increments of 1/64 inch give the set a practical size range from 1/16 inch up to 3/8 inch. This set is suited for machinists, maintenance mechanics, and fabricators who regularly drill hard ferrous metals, stainless steel, and alloy steels.

This set is intended for metalworking and multipurpose drilling tasks in both shop and field environments. The 135-degree point geometry reduces walking on hard surfaces and minimizes the need for a pilot hole on most metals. The cobalt alloy construction handles elevated cutting temperatures better than standard high-speed steel, making it a reliable choice for drilling hardened steel, cast iron, and stainless. Bits are organized in a metal or plastic storage case that keeps sizes indexed and protects cutting edges between uses. Typical users include tool-and-die shops, HVAC fabrication, plumbing rough-in on metal studs, and general industrial maintenance crews.

Key Features

• Cobalt tool material for superior heat resistance when drilling hard metals
• 135-degree standard split point reduces walking and improves hole entry accuracy
• 21-piece set covers 1/16 inch to 3/8 inch in 1/64-inch increments
• Bright, uncoated finish maintains dimensional accuracy at the cutting edge
• Straight shank fits standard 3-jaw drill chucks without adapters
• Includes metal or plastic indexed storage case to protect and organize bits

Compatibility

Designed for use with standard straight-shank drill chucks in bench drill presses, hand drills, and drill-press mills used in metalworking and general industrial applications.

Installation Notes

Cobalt drill bits are installed and removed from chuck jaws with the drill fully powered down and unplugged or locked out per applicable safety procedures. Use appropriate cutting fluid or lubricant when drilling hardened steels to extend bit life and reduce heat buildup. Secure workpieces firmly in a vise or clamp before drilling to prevent rotation and tool breakage. Inspect cutting edges for wear before each use, as chipped or dull cobalt bits can seize in hard material.