Mota Performance A70366 Chrome Crankshaft Pulley Single Groove 6.6" Diameter Strong high quality steel construction Bright polished triple plated chrome finish Except Corvette water pumps and early 265 & 283 with rivet on pulleys OEM Steel design and quality Superior quality triple chrome plating ensures longevity and lasting beauty Except Corvette water pumps and early 265 & 283 with rivet on pulleys Mounting hardware not included For best belt alignment use all the same brand pulleys