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The PROTO J52111 is a 10-piece deep socket set built for professional mechanics, HVAC technicians, plumbers, and electricians who need reliable fastener access in tight or recessed applications. The set runs on a 3/8 inch drive and covers ten inch-size sockets ranging from 5/16 inch to 7/8 inch. Each socket features a 6-point contact design that reduces the risk of rounding fastener heads under heavy torque. A chrome finish provides corrosion resistance for daily shop and field use. The set weighs 2.51 pounds, making it portable enough for service calls and van stocking.
This socket set is suited for residential and light commercial service work across HVAC, plumbing, and electrical trades. The deep profile allows technicians to drive fasteners on long bolt threads, studs, and recessed hardware that standard-depth sockets cannot reach. It is equally at home in a shop tool cabinet or a field service kit. The 3/8 inch drive is compatible with a wide range of ratchets, extensions, and flex handles common on service vans and in trade shops.
Designed for use with standard 3/8 inch drive ratchets, torque wrenches, and extensions. Fits inch-series fasteners from 5/16 inch to 7/8 inch across residential and commercial trade applications.
Inspect sockets for cracks or wear before each use. Match the drive tool torque rating to the fastener specification and do not use impact-rated sockets interchangeably with hand-drive sockets unless the socket is rated for impact use. Disconnect power, gas, or water supply as required by the system being serviced before applying tools to any live mechanical assembly.
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