The Proto PRO5431M is a shallow 31mm, 12-point chrome socket with a 1/2" drive, forged and chrome-plated from heat-treated, high-carbon tool steel and Chrome Vanadium engineered alloy steel for exceptional strength, durability, and corrosion resistance. The impact-hardened chrome molybdenum steel alloy body delivers ultimate toughness for demanding industrial and MRO applications.
An industry-exclusive socket locking key features a pushbutton release in the spinner end to quickly eject any socket, speeding up workflow and reducing downtime on the job. Ideal for professional mechanics, maintenance technicians, and industrial users requiring reliable, long-lasting hand tools.