... 428.520.530,etcsurface treatment is sandblasting,galvanizing,painting,plating,or meet your demand.We also meet your size and ... your needs.Model:____________ (415,420,428,428H,520,530 or others )Tooth:_____________ (front:13T--17T; rear :34T---57T ... )Do you want guarantee hardness? ________(YES or NO )Do you want surface burnished ? __________ (YES or NO )Besides, in order to manufactuer the accuate ...