MULTI-SIZE WRENCHES: These spanners are available in a variety of sizes, each spanner is printed with a size number so you can choose the right size for your project. DESIGN:Designed to accommodate long threads or a bar for additional torque without affecting tool strength.Double-head external hexagonal design, both heads can be used, higher practicability. MATERIAL - Made from premium Chrome Vanadium steel, drop-forged and then chrome finished for long lasting durability.Mirror finishing in high-polish chrome, which also makes them easy to clean. GREAT FOR CONFINED SPACE WORK - Widely applicable in industries as vehicle repairing and maintaining, machinery, mining, electric power and Household making -versatile for a variety of tasks and jobs.