TECHNICAL SPECIFICATION: Forged from Chrome Vanadium Steel, Hardened and Tempered, Chrome Plated, Shallow offset, Strong and thin walls, Conforming to IS 2029-21998. The De Neers double end shallow offset Ring spanners feature a looped end instead of an open one, which grips rotary fasteners tightly from all sides. As the name suggests, different sized rings are given on each end of the spanner. The worker needs to simply slip the ring around the nut or bolt, and turn to loosen or tighten. The offset design ring are cranked at 15 degree for ease of operations. You can order any metric size of the ring spanner for your requirement at www.samsindusneeds.com and get it delivered at home. HSN CODE: 82041110.