This free running threaded insert is for use on aluminum and metal. It has a 200,000 to 250,000 PSI tensile strength and a Rockwell Hardness Scale rating of 43 to 50. This insert is 0.469 inches long, with a 5/16"-18 internal thread, a #Q drill size, and a right hand thread direction. This threaded insert is made from stainless steel and comes in a pack of 100.