9pc Diamond Drill Set 28. 35. 38. 44. 54mm Nickel plated 2 Pilot Drills. adaptor and hex key Experience precision drilling with the CT2549 - 9pc Diamond Drill Set. Featuring a range of sizes, from 28mm to 54mm, this set offers versatility for all your drilling needs. The nickel plating ensures durability, while the included 2 pilot drills, adaptor, and hex key make this set a comprehensive drilling solution. Improve your drilling accuracy and efficiency with the CT2549 - 9pc Diamond Drill Set.