Depth stops like we recently mentioned don’t work with Forstner bits — or spade bits for that matter. That’s where you need a depth stop like this one from Peachtree Woodworking Supply. It works with bits up to 2-1/8″ in diameter with 3/8″, 7/16″, or 9/16″ shafts.
A built-in bearing keeps the depth stop from spinning with the bit, so it’ll stop when it comes in contact with the wood and won’t cause burn marks. The stop is held on the bit with either a 3/8″, 7/16″, or 9/16″ bushing and a second bushing. You just slide the first bushing over the bit to the desired depth and tighten the set screw, slip the stop onto the bushing, and use the second bushing to capture the stop.
For $25 you’ll be able to drill repeatable stopped holes without a drill press.