Drennan Hair Stops have a special dumbell shape that is designed to hold the hair loop securely in position.
Having miniature tapered ends, they feed easily into the smallest hair loop, even one which is wet and has stayed closed.
Hair Stops are available in two sizes 3.5mm which are ideal for small baits and mini boilies and large at 4.5mm for larger boilies or softer baits where a smaller stop might pull through.