Lee Valley Forstner Bit Set
Insetting coins to date work, to make commemorative plaques, and to store or display coin collections requires special bits since standard bits do not match coin diameters.
Sized to match Canadian and U.S. coins (with slight clearance tolerance for small variations between coins), these Forstner-style bits cut flat-bottomed holes and have sharp spurs to score the perimeter for clean entry.
Made from high-speed steel to retain hardness at high temperatures, they are finished with extra-fine grinding wheels to reduce friction.
Overall length is about 3-7/8"; shank diameter is 3/8". Sold individually or in single-currency sets in a fitted wooden box.