COMP Cams 748-16 10 Degree Steel Valve Spring RetainersOutside Diameter of Outer Spring (in): 1. 550 in. Retainer Material: Steel Lock Style: 10 degree Valve Spring Style: Standard Retainer Style: Standard Number of Springs Per Valve: Dual Outside Diameter of Middle Spring (in): 1. 095 in. Inside Diameter of Inner Spring (in): 0. 710 in. Locks Included: No Quantity: Sold as a set of 16. Notes: Will work with single or dual springs. New valve springs with larger diameters require new retainers to handle