Drill Stop Positioner, Dowel Shaft Chuck Locator, 3/4/5/6/8/10/12/16mm Woodworking Drill Bit Limit Ring Depth Stop Tool
https://www.vogueparade.com/shopping/EN/200003955/1/1005003249656093/drill-stop-positioner-dowel-shaft-chuck-locator-34568101216mm-woodworking-drill-bit-limit-ring-depth-stop-tool//