Silver & Deming Drill Bit Set: Sizes and Uses Guide
By Drill Hog® | Published: 2026-10-18
Category: Buying Guides
Learn what Silver & Deming drill bits are, their common sizes, and how to choose a set for metal drilling. Covers reduced shank benefits and practical buying tips.
Quick Answer
Silver & Deming drill bits (also called reduced shank bits) let you drill large holes with a standard 1/2-inch chuck. For most metalworking, a set covering 9/16 to 1 inch is a practical starting point.
Why Choose Reduced Shank Bits?
Standard drill chucks on most portable drills max out at 1/2 inch, so larger bits won't fit. Silver & Deming bits have a reduced shank that fits a 1/2-inch chuck while the cutting diameter is much larger. This lets you drill up to 1 inch or more without needing a larger chuck or a drill press.
The trade-off: a reduced shank can transmit less torque than a full-shank bit of the same diameter. For heavy production work, a drill press with a proper chuck and full-shank bits may be better. But for occasional or job-site drilling, the convenience wins.
What to Look For in a Silver & Deming Set
Focus on the steel type and point geometry. M7 high-molybdenum steel offers good heat and wear resistance for metal drilling. A split point helps prevent walking—the bit drifting off center when starting a hole. A tri-flat shank reduces slipping in the chuck, which is a common annoyance with round shanks.
Also check the size range and case. A set with fractional sizes from 9/16 to 1 inch covers common needs. A sturdy case keeps bits organized and protects edges.
Silver & Deming FAQ
- What sizes do Silver & Deming bits come in?
- Common sets include fractional sizes from 9/16 inch up to 1 inch, but larger diameters exist. The reduced shank is typically 1/2 inch, allowing use in standard chucks.
- Can I use them in a hand drill?
- Yes, as long as the chuck accepts the 1/2-inch shank. Use cutting fluid and moderate pressure for best results in metal. Check your drill's chuck capacity before buying.
- What is the difference between Silver & Deming and reduced shank bits?
- They are essentially the same: a bit with a reduced shank to fit smaller chucks. The name 'Silver & Deming' is traditional for this style.
- How do I prevent the bit from walking?
- Use a center punch to mark the hole, start at a slow speed, and use a bit with a split point. The 135-degree split point helps keep the bit centered. Always pilot with a center punch for accuracy.
- What materials can they drill?
- They are designed for metal, including steel. Use appropriate speed and lubrication. They can also drill wood, but metal is the primary use.
- How do I maintain them?
- Keep them sharp, clean after use, and store in a case to prevent damage. A lifetime warranty (as offered on some sets) covers defects, not wear. Regular sharpening extends bit life.
Product Facts
- 8 Pc Super Premium Silver & Deming Drill Bit Set 9/16" to 1" M7: This 8-piece set includes fractional sizes from 9/16 to 1 inch, with a tri-flat shank and 135-degree split point. The tri-flat shank prevents slipping in the chuck, and the split point reduces walking, making it easier to start holes accurately in metal.
8 Pc Super Premium Silver & Deming Drill Bit Set 9/16" to 1" M7
