Whether you want to build a unique storage case for your coin collection or find a classy way to mark the year you built your woodworking project, you’ll be hard pressed to find the right-sized bit in a regular Forstner bit set. What you need is a coin-sized Forstner bit set.
There may be sets for other countries’ coins out there, but we’ll talk about sets that have bits for the 6 sizes of U.S. coins. The bits for the U.S. coin sizes are more or less as follows:
- Pennies: 19.1 mm or 0.751″
- Nickles: 21.3mm or .839″
- Dimes: 18mm or .709″
- Quarters: 24.1mm or .949″
- Half Dollars: 30.6mm or 1.205″
- Dollars: 26.6mm or 1.047″
Okay, you will find a 3/4″ Forstner bit in most sets, so if all you want to mount are pennies, you probably don’t need any more bits, but the rest of the coins are odd sizes. Many sets come with a depth stop that also holds the bit perpendicular to the surface so you can drill level holes with a hand drill.
Pricing runs anywhere from $25 to $80 for a set of six coin-sized Forstner bits, although sets with the depth stop will run about $10 more than sets without it. You can also pick up individual bits starting at around $8.