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The end caps are designed to be glued or epoxied into the hole at the end of a handle. Holes are provided to allow the use of a lanyard made of cord or strip of leather. The end caps have been designed to fit into 5/16 inch diameter holes although depending on processing they might fit into smaller 1/4 inch diameter holes. Always measure your parts before drilling.
The main body of the cap is lengthened so that it may be inset into a larger one inch diameter hole for a different appearance and some extra adhesion area when glued into place.