... and part for racing motocycle and bicycle. Those are GR5 seat clamp for bike od31.4 and 34.8. GR2,GR5Titanium ... screw, bolt, nuts,thread rod of DIN standard from M1 to M24 ... CDM Specializing in manufaturing GR2,GR5Titanium screw, bolt, nuts, thread rod of DIN standard from M1 to M24 ... part for racing motocycle and racing bicycle.fro example. GR5 seat clamp.