Countersink vs Counterbore - The Handyman's Daughter

Understanding Countersink Drill Bits in Woodworking

The Chaz. on Instagram: "One important thing to remember when making a countersink is to make sure that the angle matches your fastener. Metric-sized fasteners typically require the use of a 90 degree countersink tool and Imperial-sized fasteners will typically require an 82 degree countersink. The tool I’m using in this video is a cheap countersink that I bought from Amazon. Is it poor quality and not very sharp, but using good practices I’m able to get acceptable results. I’ve even used this i