Competition Cams 748-16 Steel Retainers, 10 degree Angle for 1.500"-1.550" Diameter Valve Springs 10 degree retainers for 1.500 inch-1.550 inch diameter valve springs O.D. - 1.500 inch, Step 1 - 1.095 inch, Step 2 - .710 inch Precision machined from 4140 chromemoly steel and finished in black oxide Designed for positive location when combined with COMP Cams high-quality valve springs