... 3.Product precision is outstandlng, upper roller submit drum shape, the bottom of lower roller has the cooperetion regulation of beadng miler ... with working miler, it is safe for operator.5.Overall type structure, fundation is simple, moves convenience,foundation is simple, ... have rctling O ype, U type and multistage R,scope O type bending; rear curved way ,U type bending; front curved way, multistage ...