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The X-CORE PINLESS four‑lug ball‑and‑socket design provides increased durability, speed, and strength, allowing automotive technicians and industrial mechanics to quickly remove stubborn fasteners, even in the most cramped spaces. The design's 360‑degree movement gives technicians a greater range of motion and the socket wall dimensions are optimized to provide strength while retaining access to restricted fasteners. X-CORE PINLESS Universal Impact Sockets incorporate anti-fastener rounding technology, whereby the socket engages the flats of the fastener, reducing corner rounding and increasing engagement with worn fasteners.  Sizes are hard-stamped into the side wall of every socket for easy identification.