SL7601 - PROFFESIONAL STYLE ALUMINUM SPRING CUPS, HAS A LARGE, BUT THIN FLANGE TO FLATTEN HARDWARE. PROS USE THESE TO COVER UP ENLARGED HOLES, WHEN ADAPTING DIFFERENT MANUFACTURER'S HARDWARE TO ENDBELLS. THE FLANGE IS THIN, UNLIKE OTHER FLANGED CUPS, THEY DO NOT LIFT THE SPRING TOO HIGH, WHICH CAUSES SPRING BIND-UP, SPECIALLY ON 4 AND 5 COIL SPRINGS. THE TOP FLANGE IS TAPERED TO MAKE SPRING INSTALLATION EASY, BUT REMOVAL HARDER, SO IT WILL NOT COME OFF DURING RACING. BLUE ANODIZED FOR PROTECTION OR COLOR CODING S7601