COMP Cams Lightweight Tool Steel Retainers provide the best of all valve train benefits: light weight, along with exceptional strength and wear characteristics. Approximately 33% lighter than conventional chromemoly steel retainers and only 2-4 grams heavier than titanium (depending upon application), they are made from high-grade tool steel, making them able to withstand even the most demanding race applications. * CNC-machined for consistent quality * Developed using latest FEA and CAD software * Spintron-tested to extreme RPM to prove strength is equivalent to titanium and stronger than chromemoly steel * Designed for both 7° and 10° angles PartNumber : cca1730-1 Description : Light Weight Tool Steel Valve Spring Retainers; Single Piece Title : 1730-1 Retainers, Lite wt Tool Stl 1.4 37" 10deg California Proposition 65 : WARNING: Cancer and Reproductive Harm P65Warnings.ca.gov Compatible Lock : 638-1 Diameter 1 : 1.375 Diameter 2 : 1.065 Diameter 3 : 0.7 Lock Angle : 10 Retainer Material : Tool Steel Valve Spring Diameter : 1.437-1.500 Valve Stem Size : All Diameter 4 : N/A Angle : 10° Diameter 1 : 1.437" Diameter 3 : .700" Stem Size : All Diameter 2 : 1.065" Spring Diameter : 1.437"-1.500" Engine Components::Valve Springs, Retainers