A combination wrench is a type of wrench that has an open-end jaw on one end and a box-end on the other. Both ends are the same size. Combination wrenches are available with 6-, 8-, or 12-point box ends and with or without offset open ends and handles. Two sets of wrenches should be part of any automotive tool kit, one for holding and one for turning. The combination wrench is a good choice for the second set as it complements either open-end or box-end sets.