This two piece 6 inch street pulley is made from 6061 T-6 aluminum and bolts to a steel hub to insure strength. The machining process includes the stock style thread to eliminate crank case blow by. The belt groove is matched to the stock offset for proper alignment. After anodizing the pulleys are machined for the 360 degree timing marks to eliminate the old style stickers. The two pieces are mated together by 8 countersunk allens to cap off the quality build of the part. Uses a 10x 877 Belt. Choose your color.