The Proto J4990-5MXL is an extra long hex bit socket designed for 3/8-inch drive tools, delivering reliable torque transfer for fastening and loosening hex fasteners in hard-to-reach areas. Built to Proto's professional-grade standards, it is a dependable choice for industrial, MRO, and mechanical applications.
The 5mm hex bit size makes this socket ideal for metric fasteners commonly found in machinery, automotive, and equipment maintenance tasks. Its extra long length provides added reach and clearance when working in deep or confined spaces.