SRAMCenterLine Disc Brake Rotor - 200mm, Center Lock, Silver

I wanted to have a second wheel set for my Specialized MTB. When choosing a brake disc the sram centerline brake indicates the outer circumference but no standard for the inner six bolt circumference. A front bike crank for instance indicates the number of teeth and the inner circumference. Anyway I ordered a 200mm Sram centerline brake disc and it didn't even come close to fitting my wheel hub. I had to match the image and order one from China (six bolt, 200mm sram centerline) and that did fit -- evidently sram makes different inner diameters but I can't find out how that size is indicated? I gave this a four because of the confusion? mine or their's? ?centerlock??vs regular six bolt?? This hardware needs more documentation to explain.

Reread description. Rotor pictured is not the rotor being sold.

Photo not as described. Please read description.

Fits perfectly. Works with avid code rsc.