These depth stops fit over a standard ½" diameter countersink bit and allow the bit only to drill down to a specified depth. This greatly speeds up countersinking when drilling multiple holes for the same screw size. The set includes stops for the following hole depths:  4.6mm, 5.0mm, 5.4mm, 5.8mm, 6.2mm, and 6.6mm. A small tray is provided to hold the stops.

Update 11/13/2024.  Added a slit so the stops slide on and off more easily.

Instructions for use.  Countersink the first hole normally, without using any depth stop. Using the first hole as a guide, select the depth stop that best fits the hole’s depth. The stops are designed to fit tightly and can be installed with a twisting motion while the countersink bit is chucked in the drill.

Printing tip.  For a looser (or tighter) fit, print the depth stops at greater (or less) than 100% scale in the X and Y dimensions (not Z). Try changing by increments of 0.15%.