PROTO® Industrial Tools Official Site | PROTO- stanley proto locking pliers set ,PROTO® engineers and manufactures industrial tools that are safe, reliable, and made in the USA. Tethered Tools SkyHook Transfer System Lanyards & Accessories PPE Tethering Tether-Ready Hand Sockets Tether-Ready Ratchets Tether-Ready TorqueProto® 6 Piece Locking Pliers Welding Set - Proto IndustrialProto® 6 Piece Locking Pliers Welding Set. ITEM #:J298XL. Features and benefits. Features and benefits. Locking mechanism helps leave both hands free when clamping, helping to eliminate squeezing action and general hand fatigue when manipulating. High corrosion-resistant finish with welding spatter resistance.