... ,14M,20M),T/AT Timing pulleys (T2.5,T5,T10,T20,AT5,AT10),etc. timing pulley HTD ,Timing pulleys (XL,L,H ... ,XH,XXH) HTD Timing pulleys(3M,5M,8M,14M,20M ... balanced.we can also supply the flanges of the timing pulleys according to the pulleys part numbers.all series ... treatment:black oxide,phosphate,anodize and zinc plating. timing pulley HTD