The LT 4300 3 piece Twist Socket Lug Nut Removal System is for the removal of DAMAGED/ROUNDED 3/4″/19mm, 13/16″, and 21mm lug nuts (LT4200A) and the majority of OEM and after market LOCKING LUG NUTS (LT400-25). These sockets are dual sided. Works with a breaker bar or other related tool. Includes an extractor punch (LT-400-7).