The STANLEY 70-391E Shallow Offset Bi-Hex Ring Spanner (25x28mm) is a high-quality hand tool designed for professional and industrial applications. Product Overview Model: 70-391E Size: 25x28mm Type: Shallow Offset Bi-Hex Ring Spanner Material: Chrome Vanadium Steel Finish: Matt Standards: IS 2029 Design Features: Anti-slip design on open end Maxi-Drive? system to reduce fastener rounding Shallow offset for better access in confined spaces