Wrenches in Metal Box are made of chrome vanadium steel. Product Description:Wrenches ... vanadium Steel. Surface Treatment: Chrome Plated. Sizes: 6*7mm, 8*9mm, 10*11mm, 12*13mm, 14*15mm, 17*19mm. Packing ... : steel box QTY: 6 pcs. GW/NW: 9.5/9 kgs MEAS ... *30CM Sizes Available: metric system & British system. 6*8mm, 8*10mm, 10*11mm, 10*12mm, 11*13mm, 12*13mm, ...