Features and Benefits:?Apply anti-seize lubricant to threads before use?Desgined for Milwaukee Core Bits?Extends Milwaukee core bits by 6"?For core bits with 5/8"-11 threadsThis core bit extension from Milwaukee? may be exactly what you need to keep your next project moving. Even the most expensive drills are worthless without the proper drilling equipment. This extension bit helps establish the proper sizing for jobs like cutting through concrete, brick, pavers, stone, and more.