With the increased internal diameter, this is more for use on the rig body, again mainly for sliding stop knots. It can also be used as a stand off on your hook lengths/snoods to help prevent tangles. 1.5mm (1 metre) internal diameter. Gemini Tackle Ltd has been designing and producing high quality terminal tackle here in the United Kingdom since 1990, when the company was founded by Tony and Lyn Caton. Over the years the company has gone from strength to strength, and is now recognised within the Sea Fishing community for its innovative and high quality products.