Rotary Tool Accessories

Precision Rotary Drill Bits and Sets

The bit that determines the hole diameter may have a different dimension where it meets the holder. Check the bit size and shank size separately before choosing a set.

What to check before buying

Start with the exact hole size and the material, then match the bit model. Check which diameters the package includes and whether the tool’s holder accepts each required shank. Compare glass-oriented products separately from general drill sets and look up the manufacturer’s tool and application limits.

Look at the size list, not the total

The Proxxon 28874 covers ten small metric diameters. The 28876 brad-point set covers a different range and keeps a common shank. Choose the exact bit size and workpiece first.

Check the tool-side size separately

The diameter of the hole and the shaft held by the tool can differ. In a mixed set, read the holder requirements for each bit you intend to use.

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Manufacturer references

Questions about this department

Does the largest listed diameter describe every bit in a set?

It can be the top of a range. Use the exact contents list to confirm that the diameter you need is included and check the shank size for that bit.

What does the diameter field refer to?

Look for separate measurements for the cutting end and the shank. The first helps determine hole size and the second determines holder fit.

Buying guides