The quick-release drill system for drilling, countersinking and screwing designed for use with Power Drills and Screwdrivers and is compatible with direct-drive 1/4in Hex Shank Power Bits. Drill Size.3.6mm. (9/64in). Countersink Size. No.12. https://elecena.pl/product/27169504/trend-snap-cs-12-countersink-with-9-64in-drill 2024-11-07 https://elecena.pl/product/27169504/trend-snap-cs-12-countersink-with-9-64in-drill 2025-03-18