This is a RPM 1/16" Allen Driver. RPM has painstakingly designed the ultimate hex drivers on the market! RPM uses heat treated, high grade, quality tool steel to produce an Allen driver that is unbelievably strong, durable, and wear resistant. The handle is molded out of a highly impact and oil resistant material that is typical of all RPM parts and tools. The tip is molded directly into the handle, no assembly required.