Rather than have a set of counter sink bits that may not be the exact size you need, you could replace them with one adjustable countersink boring bit. Amana’s Di-Count fits over drill bits sized 3/32″ to 9/32″ to drill counter sunk holes for wood screws sized #2 to #18.

The 2-wing carbide-tipped bit will countersink screws up to 7/16″ deep. The countersink bit measures 1-1/4″ long and uses two screws to clamp around the pilot bit. Before shipping charges take a bite out of your wallet, you’ll pay about $23 for the Di-Count adjustable countersink boring bit.

Di-Count [Amana Tool]
Di-Count [ToolsToday]
Via Amazon [What’s This?]