Very pleased this is the 3rd purchase I have made in the last 15 years or so and they really work good with a good amount of use over that time. I love how cleanly they drill a hole in hardwood, softwood and MDF. The countersink works effortlessly even after repeated use. This creates clean and evenly tapered bolt holes without the need for a locking ring. I give this my highest recommendation, you will be very satisfied with this countersink.