This GearWrench Flex Combination Ratchet Wrench 16 Piece Metric Set is designed with a 72 teeth ratcheting box end which needs as little as 5 degrees to move fasteners VS the standard box end wrenches with 30 degrees. Features a flexible head and a knurled side beam for ratcheting direction indicator. With Unique Technology on Box End it provides off-corner loading for better grip and reduced fastener rounding. Sizes included are 8mm, 9mm, 10mm, 11mm, 12mm, 13mm, 14mm, 15mm, 16mm, 17mm, 18mm, 19mm 21mm 22mm 24mm and 25mm.