Amana No-mar Ball-bearing Countersinks by Chris Marshall • Apr 9, 2013 Print Print In an effort to eliminate the marring that can occur when drilling countersunk holes with a typical fixed-collar bit, Amana Tool® now offers four sizes of countersinks that feature a ball-bearing depth stop. Mounted on a thrust bearing for quick and easy adjustment of the countersink depth, the oversized collar also has an opening in the side for efficient chip evacuation. The countersink cutters have a pair of carbide tips, which provide longer-lasting and cleaner cuts without tearout. Users can adjust the depth of the pilot hole as well as the countersink to set screw heads flush with the work surface or in order to recess them for wood plugs. Set screws on the tool lock the depth settings and also make it possible to replace the drill bit, should it dull or break. The countersink’s overall diameter is 3/8-in., and the available pilot bit sizes are 3/32-, 1/8-, 9/64- and 5/32-in. The tool’s 1/4-in. hex shank is suitable for drill presses, handheld drills or boring machines. A double hex key for making adjustments is included. Prices for the new countersinks start at $37.13, and they are available from Amana Tool dealers now.