Profile: Glazelock Shims, Inc. produces interlocking, non-interlocking and stackable plastic shims. Our standard plastic shim sizes are 1 1/2 by 3" and 3 by 4" in thicknesses of 1/4", 1/8" & 1/16". Our shims are used for windows, storefront doors, curtain walls and stone applications. We render rotting, shrinking and swelling services.