Features A Spanner is a tool used to provide grip and mechanical advantage in applying torque to turn objects—usually rotary fasteners, such as nuts and bolts—or keep them from turning. Spanners are made from Drop Forging High-Quality Chromium - Vanadium alloy. To resist corrosion and help in cleaning the spanner they are then Chrome or Satin Plated. Anti Corrosion Double Chrome Polish / Satin Polish. Heavy Duty Drop Forged Chrome Vanadium Body. 45 Degree Deep Offset for Easy Use. Size / 16x17 mm Length / MAX 255 - 248 TORQUE KG - M / Small End: 17.5 / Large End: 20.1