The Capri Tools Super-Thin Open End Wrenches have ultra-low profiles that let you reach fasteners in tight clearance. As thin as 2.2 mm to 5.6 mm, these open end wrenches are truly versatile and come in handy in a wide variety of applications. These super-thin wrenches are constructed of our premium Chrome Vanadium steel, forged with a complete 10-step state of the art heat treatment process. They are made for serious professional and made to last. Each is plated with our flawless SmartKrome plating, achieved through thorough polishing and careful application, to ensure durability and corrosion resistance. Set comes with 14 open end wrenches with 20 metric and 8 SAE sizes: 6 mm, 7 mm, 8 mm, 9 mm 10 mm, 11 mm, 12 mm, 13 mm, 14 mm, 15 mm, 16 mm, 17 mm, 18 mm, 19 mm, 20 mm, 21 mm, 22 mm, 23 mm, 24 mm, 1/4 in., 5/16 in., 3/8 in., 7/16 in., 1/2 in., 9/16 in., 5/8 in. and 3/4 in. Thinness: 2.2 mm thin (6 mm to 7 mm and 1/4 in. to 5/16 in. open ends), 2.6 mm thin (8 mm to 11 mm and 3/8 in. to 7/16 in. open ends), 3.6 mm thin (12 mm to 15 mm and 1/2 in. to 9/16 in. open ends), 4.6 mm thin (16 mm to 19 mm and 5/8 in. to 3/4 in. open ends), 5.6 mm thin (20 mm to 24 mm open ends). Comes in our own spill-resistant Mechanics Tray for easy organization and storage. Tray dimensions: 15-3/4 in. L x 7-1/2 in. W x 1-1/4 in. H, fits comfortably in most tool chests and cabinets.