Triumph Twist Drill 099857 Drill Bit Set 15 Pc Hss

Product Description

The TRIUMPH TWIST DRILL 099857 is a 15-piece jobber length drill bit set built for heavy-duty drilling in metal, wood, and general fabrication applications. The set covers 1/16 inch to 1/2 inch in 1/32-inch step increments, giving tradespeople a full working range in a single case. All 15 bits are machined from high-speed steel (HSS) with an oxide finish that reduces friction and helps resist heat buildup during extended use. The 135-degree split-point tip starts on contact without a center punch, reducing walking and improving hole accuracy. Straight shanks fit standard drill chucks without modification.

This set is suited for electricians, plumbers, HVAC technicians, and general contractors who need a reliable jobber-length drill assortment on the job. Jobber-length bits offer a practical balance of reach and rigidity for through-hole drilling in sheet metal, pipe flanges, studs, and structural members. The T18HD series designation indicates a heavy-duty classification, making these bits appropriate for demanding trade environments rather than light-duty occasional use. The included metal storage case keeps bits organized and protected between uses on the job site or in a service vehicle.

Key Features

• 15-piece set covering 1/16 inch to 1/2 inch in 1/32-inch increments
• 135-degree split-point tip eliminates walking and reduces the need for a center punch
• High-speed steel construction handles heat and wear in metal drilling applications
• Oxide finish reduces friction and extends bit life during heavy use
• Straight shank fits standard 3-jaw drill chucks
• Metal storage case included for organized transport and protection

Compatibility

Designed for use with standard drill chucks accepting straight-shank jobber-length bits in the 1/16 inch to 1/2 inch size range, compatible with corded and cordless drills and drill presses used across electrical, plumbing, and HVAC trades.

Installation Notes

Secure the bit firmly in the chuck before operation and verify the chuck key is removed prior to starting the drill. When drilling metal, use appropriate cutting fluid or lubricant to extend bit life and manage heat. Electricians and plumbers should follow NEC and IPC guidelines respectively when drilling through structural or fire-rated assemblies. Inspect each bit for wear or damage before use and replace any bit showing chipping, cracking, or excessive dulling.