Outside Diameter: 1.260" Inside Diameter: 0.785" Closed: 114 lbs. @ 1.710" Open: 318 lbs. @1.210" Coil Bind @: 1.160" Spring Type: Single with damper -fits small block chevy engines from 1955-1993. Good for towing, rv, and mild camshaft applications with lifts up to .550".