Drill Bits

I need to drill a hole for a 3/8″ bolt, but i only have metric drill bits, do i use 10mm or 11mm drill?
Drilling the whole to bolt together pine sleepers for a retaining wall. Thanks.
That is a kind of sloppy application (not high precision) so you could use the 11mm. If the hole is too tight then either bang on the end of the bolt with a mallet or wiggle the drill to make a wider hole as it is cutting. The extra slop in the hole dimension is not critical there.
How to Bind a Book : Book Binding Supplies: Needles & Drill Bits
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