Competition Cams 747-16 Steel Retainers, 10 degree Angle for 1.437"-1.500" Diameter Valve Springs 10 degree retainers for 1.437 inch-1.500 inch diameter valve springs O.D. - 1.400 inch, Step 1 - 1.050 inch, Step 2 - .690 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