material available: steel, stainless steel 303 (a1), stainless steel 316 (a4 / 18-10), brass c3604 surface finsih available: cr3 white/yellow zinc plated characteristics: 1.easy to installed. 2.designed to replace spring coil. 3.provide strong threads for weak material like aluminum or plastic. 4.able to install for vibrating environment. appications: 1.can be applied to different material such as plastic, aluminum, cast iron. 2.designed to apply in weak material where threads are frenque
