EngValve Spring Shim, Shim Kit 1.500" Assorted, Valve Spring Shim Kit - 1.500" OD, .645" ID, .015", .030", .060" Thickness, None, This COMP shim kit includes a number of 1.500" diameter shims of various thickness. This kit includes 16 .015" thick shims, 16 .030" thick shims and 16 .060" thick shims., Engine Valve Spring Shim.