Dremel 631 brad-point drill set
Four brad-point diameters from 1/8 inch through 1/4 inch, all on 1/8-inch shanks in the manufacturer’s 631-01 set.
How to choose
The common shank size keeps the holder check the same across the set. Verify that the hole size you want is among the four supplied diameters.
Compatibility and limits
Four brad points · 1/8-inch shank on each included bit
Care
Before mounting the accessory, check its speed rating against the tool and use the holder specified for its shank or mandrel. Refer to the exact model instructions for the workpiece.
Questions before buying
Does the set cover the smaller diameters in the 628 twist-bit kit?
The 631 starts at one eighth of an inch and adds three larger working diameters. Compare the 628 if your pilot hole is smaller than that range.