Cobalt M42 Silver & Deming Drill Bit Set Sizes
By Drill Hog® | Published: 2026-10-25
Category: Buying Guides
Learn the sizes and uses of the Drill Hog Cobalt M42 Silver & Deming drill bit set, from 1-1/16" to 1-1/2". Get decision rules for choosing the right jumbo bit set.
Quick answer
The Drill Hog 8-piece Cobalt M42 Silver & Deming drill bit set covers fractional sizes from 1-1/16" to 1-1/2", making it ideal for heavy-duty metal drilling with a standard 1/2" chuck drill.
Why choose Cobalt M42 over standard HSS bits?
Cobalt M42 alloy contains 8% cobalt, which retains hardness at higher temperatures than high-speed steel (HSS). This means the bits stay sharp longer when drilling stainless steel, titanium, or other tough alloys. The trade-off is cost: cobalt bits are more expensive upfront, but they reduce bit changes and downtime on demanding jobs.
Understanding the reduced shank design
Silver & Deming bits have a 1/2" reduced shank that fits any drill with a 1/2" chuck, even though the cutting diameter is much larger. This lets you drill holes up to 1-1/2" without needing a larger, heavier drill. The trade-off is that the reduced shank can be a stress point if you apply excessive side load, so keep the drill aligned with the hole axis.
Decision rules for choosing jumbo cobalt bits
- Match the size range to your hole diameter needs: This set covers 1-1/16" to 1-1/2" in 1/8" increments. If your largest required hole is 1-1/2", this set is a perfect fit. For holes above 1-1/2", look for a separate larger bit or a different set.
- Check your drill chuck capacity: All bits have a 1/2" reduced shank, so any drill with a 1/2" or larger chuck can use them. If your drill only accepts 3/8" shanks, you'll need an adapter or a different bit style. Ensure your drill has at least a 1/2" chuck before purchasing.
- Prioritize cobalt for hard metals: Use this set for stainless steel, titanium, hardened steel, and other tough alloys. For mild steel, aluminum, or wood, standard HSS or carbon steel bits are more economical.
Product facts
- 8 Pc Cobalt M42 Jumbo Silver & Deming Drill Bit Set 1-1/16" to 1-1/2" Drill Hog®: 8 fractional sizes from 1-1/16" to 1-1/2"; 1/2" cut down shank; 135° split point prevents walking; tri-flat shank prevents slipping; lifetime warranty. The 135° split point ensures the bit starts exactly where you place it without wandering, and the tri-flat shank locks into the chuck to avoid spinning under heavy torque.
8 Pc Cobalt M42 Jumbo Silver & Deming Drill Bit Set 1-1/16" to 1-1/2" Drill Hog®
Who this set is for
Best for
- Metal fabricators drilling 1" to 1-1/2" holes in stainless or alloy steels
- Maintenance crews who need one set that covers common jumbo sizes without swapping bits often
- Shops with standard 1/2" chuck drills who want cobalt longevity
Not for
- Woodworkers or DIYers who only drill soft materials and can save money with HSS bits
- Jobs requiring holes larger than 1-1/2" diameter
- Drills with 3/8" chucks that cannot accept the 1/2" reduced shank
