metal female threaded standoff round standoff material:aluminum Rohs approve round metal female threaded standoff material choices: steel, aluminum, stainless stell, brass, nylon, phenolic, zinc alloy various size & thread & length & material available surface treatment: brass ASTM-B-16, nickel plated ( QQ-N-290) aluminum ASTM-B211 clear iridite finish ( MIL-C-5541) nylon 6/6 UL Rated 94V-2 ...