Description: Precisely-sized, chamfered ends insert smoothly into fastener head, reducing wear. Color-coded housing for instant measurement identification. Hinged case opens flat, making it easier to get wrenches in and out and high visibility size markings make for fast size selection. Long arm wrenches provide extra reach and greater torque. Chamfered hex key edges to give better fit and reduce stripped fasteners. Durable caddy keeps keys organized and has marked slots for each key. Specification: Material: S2 Alloy Steel Size Chart: Metrix sizes: 1.5mm, 2mm, 2.5mm, 3mm, 4mm, 5mm, 6mm, 8mm, 10mm; (0.06in, 0.08in, 0.10in, 0.12in, 0.16in, 0.20in; 0.24in, 0.31in, 0.39in) Length: Long arm /Short arm: 1.5mm: 75mm/15mm?2.95in/0.59in); 2mm: 82mm/18mm (3.22in/0.71in); 2.5mm: 86/20mm (3.39in/0.79in); 3mm: 96mm/22mm (3.78in/0.87in); 4mm: 110mm/25mm (4.33in/0.98in); 5mm: 122mm/32mm (4.81in/1.26in); 6mm: 136mm/36mm (5.35in/1.42in); 8mm: 152mm/40mm (5.98in/1.57in); 10mm: 175mm/45mm ( 6.89in/1.77in); You can also consult the picture about the size. Package Includes: 1 Set Allen Wrenches Note: Please allow 1-2mm error due to manual measurement. And due to the light and screen difference, the item's color may be slightly different from the pictures. Please kindly understand. Make sure you don't mind before you order