You get 25 assorted unused HSS and cobalt 1/4-28 Threaded reamers and core drills. Core drills are super precision drill bits that eliminate the need to follow up with a reamer. The sizes range from 3/16" - 3/8". All of the are guaranteed sharp. Your assortment may vary but the quantity and quality will not. Surplus from Boeing Aircraft. Made in the USA quality.