12 pc. Metric XL Locking Flex set includes - 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18 & 19mm 13 locking positions with flex head and one finger operated lever with options of "locking" or "not locking" positions Ratcheting box-end needs as little as 5 degrees to move fastener VS. 30 degrees for standard box end wrenches 15% longer than current Flex Head ratcheting wrench to increase length to access those hard to reach fasteners Surface Drive Plus provides stronger grip on fasteners, nearly eliminating fastener rounding, Manufacturer: GearWrench