US sizes. 8-piece set. Incl. 8 wrenches with an open end on one side and a ratcheting box end on the other side. With identical sizes on both ends. Packed in a robust textile pouch. Color coded for size. When everything fails, it’s time to play your Joker. – Open end. The Joker has a non-angled 12-point beak, therefore it requires just 30° of working space, otherwise it functions just like a regular open end wrench. The dark metal plate dual functions as a retainer, preventing the nut to slip through the wrench beak or it holds the nut. 30° further the metal retainer plate allows the nut to slide through, or grip it since the metal plate is equipped with a hardened ragged edge. The teeth of this edge will ‘bite’ itself into a rounded-off nut, loosening it where others do nothing but slip-off. – Box end. Comes with a very fine 80 tooth ratchet for a small 4.5° return angle. Ratcheting direction is indicated on both sides. Set includes: Size: 5/16″ Overall length: 144mm. Size 3/8″ Overall length 159mm. Size 7/16″ Overall length 165mm. Size 1/2″ Overall length 177mm. Size 9/16″ Overall length 188mm. Size 5/8″ Overall length 212mm. Size 11/16″ Overall length 235mm. Size 3/4″ Overall length 246mm.