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 : cca1772-12 Description : Light Weight Tool Steel Valve Spring Retainers; 12 Pieces Title : 1772-12 Retainers, Tool Steel for 2691 5 and 26918 Diameter 1 : 1.030" Diameter 2 : .640" Diameter 4 : N/A Spring Diameter : 1.055" Diameter 3 : N/A Stem Size : 8 mm Angle : 7° Engine Components::Valve Springs, Retainers