TECHNICAL SPECIFICATION: Forged from Chrome Vanadium Steel, Hardened and Tempered, Chrome Plated, Each Head set at 15 angle, Conforming to IS 2028-2004. The Double End Spanner set, populary known as DOE spanner set is a combination of one-piece wrenches with a U-shaped openings that grips two opposite faces of the bolt or nut. These spanner sets are usually Double-ended, with a different-sized opening at each end. The ends are generally oriented at an angle of around 15 degrees to the longitudinal axis of the handle. www.samsindusneeds.com stocks all sets of the De Neers Double open end spanner sets with some great pricings. HSN CODE: 82041110. PRODUCT CODE: 12-6M.