... racing motocycle and bicycle. Those are GR5 seat clamp for bike od31.4 and 34.8. GR2,GR5Titanium screw, bolt, nuts,thread rod ... , DIN84, DIN85, DIN963, DIN7991, DIN6912, DIN931, ISO7380, ISO7380 Trox25 M5*8, etc.A. mini screw and nuts: M1.0 to M4 ... part for racing motocycle and racing bicycle.fro example. GR5 seat clamp.