The Quality Craft Tools Metric Combination Wrenches include sizes from 10mm to 50mm with no skips. These wrenches are offered in four different metric sets, which includes 10mm to 30mm, 31mm to 40mm, 41mm to 45mm and 46mm to 50mm. QCT also offers the traditional SAE combination wrench from 3/8” to 2”. These wrenches come with a lifetime guarantee.