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These heavier 1.3mm thick stainless steel knurled link pins are handy for repairing your band. With 20 different sized pins available in the most common lengths, it allows for you to choose the correct length pin to fit your watch band links. Knurled pins are great to use as a replacement because they are heavy duty and sturdier than cotter pins which can keep falling out. Using these heavier solid pins in place of cotter pins will help to extend the life of your watch band making it more secure. You can also use knurled link pins to replace screw type link pins once the threaded pin hole has become stripped, allowing you to continue to use your favorite watch band. One side of each pin has a serrated star at the end that pounds into the pin hole last and keeps the pin held firmly in place. This is a heavier or thicker 1.3mm version of the 1mm 81.231 knurled link pins.