Muteki SR48 Open End Lock Sets are constructed from cold forged 50BV30 chrome vanadium. Each lug nut weighs only 2 ounces. Muteki SR48 lug nuts and locks are compact, designed to accommodate small diameter wheel holes found in today's high-end street, lightweight racing, competition road wheels. Constructed with an oversized 60-degree tapered seat that provides a better contact area. A knurled perimeter top allows for easy installation. The open top nut allows for full stud engagement, accommodating long race studs. Each set of Muteki SR48 open end lock sets include 4-locks and 2-lock key adapters.