"recision machined from chromemoly steel then black oxided, these 7 degree retainers are designed specifically for 11/32" valve applications with our 26915/26918 Beehive valve springs. The 787-12 retainers are often used with our 26915, 26918 and 26981 Beehive Springs in Chevrolet 194-250 and 4.3/262 engines, as well as the Buick Grand National 231 6 cylinder engine. Valve springs with larger diameters require retainers to handle the higher pressures developed by the springs. COMP Cams steel retainers are precision machined from chromemoly steel and finished in black oxide. These precision retainers are specifically designed for positive location when combined with COMP Cams high-quality valve springs. For superior strength and ultimate stability, both 7 and 10 retainers and valve locks are available."