I'm sure Raf will have the definitive answer, but in the meantime, I have a used sling strap which I believe was originally from woodman which is 5/8" or 15 mm. and that closely matches the width of the original Webley sling strap, although the used one is considerably longer at a shade over 32". I do believe the screen accurate strap has tied-off ends, rather than the loop/snaps the Webley and this used strap boast.