This 20 piece ratcheting wrench set includes the following metric and SAE sizes: 6, 8, 10, 12, 13, 14, 15, 16, 17, 18 mm and 1/4, 5/16, 11/32, 3/8, 7/16, 1/2, 9/16, 5/8, 11/16 and 3/4-inch. Constructed of chrome vanadium steel and heat treated for strength and durability with a professional grade, high polish finish. 12-Point box end allows work on 6-point and 12-point fasteners. 90-Tooth ratcheting end provides 4° of arc swing. Zero-degree box end allows access to narrow work spaces where a ratchet and socket can't fit. Hard-stamped size callouts and color-coded stripe make it easy to identify metric (blue) and SAE (red) measurements. Meets or exceeds ASME specifications. Hassle-free lifetime guarantee