... . Surface Treatment: Chrome Plated. Sizes: 6*7mm, 8*9mm, 10*11mm, 12*13mm, 14*15mm, 17*19mm. Packing: steel box QTY: 6 ... : metric system & British system. 6*8mm, 8*10mm, 10*11mm, 10*12mm, 11*13mm, 12*13mm, 12*14mm, 14*15mm, 14*17mm, 19*21mm, 20 ...