The quality of ATE drums is characterized by the fact that we let the system competence from series production flow into their development. You can rely on a proven high quality standard applied worldwide. Close dimensional tolerances ensure a high degree of accuracy, for example. The cylindricity (deviation of friction surface diameter from the theoretical cylindrical ideal) is max. 5/100mm. Product Features:Manufactured to OE specifications Integrity to original designThe ATE drums are made exclusively of high-grade cast iron with a homogeneous microstructure.Important functional dimensions are completely verified in production.Optimum surface roughness and good thermal conductivity makes for stable friction coefficients.The ATE drum permits problem-free fitting during installation.Part number, coded batch number, and manufacturing date are stamped into the brake drum.Fitting instructions are included.