GP sockets and tools use the highest quality chrome-molybdenum alloy steel and state-of-the-art manufacturing processes and equipment. Thorough and exact heat treatment, as well as rigid quality control, ensures the correct balance of strength and durability for high impact jobs. Set contains all standard length 12 point sockets in metric sizes, a 24 tooth quick release ratchet, and two extensions. Metric sizes 10mm to 36mm. Packaged n blow molded case.