Tighten and loosen operation with 1 bottle of 4 sizes. When using an outer socket, the inner socket is easily pushed up, and the spring will return to its original position after use. Short type of curved spear (SRF1 has safety rope hole with straight spear) SRF2/3 has a convenient slide hole for attaching safety rope. Non-slip collar groove design on grip "Development is the manufacturer vital way to contribute to the good of the society." Since its establishment in 1918, it has developed a variety of products through techniques and creativity that has passed 100 years of tradition and history. Since its inception, hand tools have been manufacturing For nearly a century, we have continued to develop new products based on the business motto, "pursuing more safety and efficiency". The large selection of products is highly appreciated and welcomed not only in the world but also in the domestic market. With a focus on quality first policy based on "customer satisfaction", we are actively developing new products applicable to new business sectors. [Product] 1. General hand tools: wrench/spanner/pliers (ratchet wrench, offset wrench, adjustable wrench, C-clamp, grip pliers, socket wrench, etc. ,) Plumbing tools (tube cutter, flare tool, pipe wrench, super tongue, motor wrench, PVC pipe cutter, etc. ,) Pullers (Gear Puller, Armature Bearing Puller, Bearing Puller, Shock Speed Puller, etc. 2.Industrial equipment tools: fixtures and tools (jig blocks, jig plates, precision vices, clamp tools, knurling holders, bite holders, carbide burrs and so on. Lifting Clamp (for steel, concrete, housing) Crane (JIB Crane (stationary type, post fitting type, movable, portable telescope type), free crane, portable gate type crane, multi-crane, clean room crane, special crane, and other air equipment (vacuum chuck and micro air grinder).