Specification:1. Materai: Aluminum,Website:http://www.blfspchina.com, Brass, Steel or other customized requests SUS201,SUS304,SUS316,A2-70,A2-80,A4-80,4.8 6.8 8.8 10.9 12.92. Size: M4-M163. Standard: DIN GB ISO JIS BA ANSI4. Certification: ISO9001, SGS, ROHS5.Model: BLFC-043