Valve springs with larger diameters require retainers to handle the higher pressures developed by the springs. COMP Cams steel retainers are precision machined from 4140 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. Refer to the spring application chart on pages 293-303 for correct retainer part numbers for each COMP Cams valve spring. PartNumber : cca778-1 Description : Steel Valve Spring Retainers; Single Piece Title : 778-1 Steel Retainers, Acura B18 Diameter 2 : 0.868 Lock Angle : 7 Retainer Material : 4140 Chromemoly Steel Valve Spring Diameter : Stock Valve Stem Size : Stock California Proposition 65 : WARNING: Cancer and Reproductive Harm P65Warnings.ca.gov Compatible Lock : 7 Diameter 1 : 1.103 Diameter 2 : .868" Diameter 3 : .608" Diameter 4 : N/A Spring Diameter : 1.103" Diameter 1 : 1.103" Angle : Stock Stem Size : Stock Engine Components::Valve Springs, Retainers