- One of a comprehensive range of Premier Hand Tools, suitable for daily professional use.- Manufactured from heat treated and hardened Chrome Vanadium steel with matt chrome finish.- Jumbo sizes suitable for industrial and agricultural applications.- Keys range in length from 130mm to 340mm and in size from 3mm to 17mm.- Sizes: 3, 4, 5, 6, 7, 8, 10, 12, 14, 17mm.- Supplied in tough storage case.- Lifetime guarantee*.