The W Series tapered caps and plugs with wide flanges feature a wider flange than standard tapered caps. These parts offer added protection for bearing surfaces and cannot be accidentally pushed all the way into or through an opening when used as a plug. The caps/plugs cover a vast range of cap or plug applications. Easy to install and remove.:: a: 0.590, b: 0.670, C: 0.528, D: 0.608, E: 0.50, F: 1.00.