This Ashland Evolutions Cover and Handle measures 5-19/32 inches across. The Right Hand Cover and Handle work on the Silver Colored Splines, and the Left Hands work on the Gold Colored Splines.
Ashland Operator Cover measures 4 inches across. We find the number US Patent Pending P-1080-100 on the Left Hand Covers and P-1080-200 on the Right Hand Covers.