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This thicker 1.3mm stainless steel knurled link pin assortment is handy for repairs because it contains 10 different sized pins. This assortment contains some of the most common lengths allowing for easy band repairs on metal watch band links. Knurled pins are a great thing to have around your workbench because they are heavy duty and sturdier than cotter pins which are known for falling out of place. Using these stronger more sturdy solid pins in place of cotter pins will help to extend the life of your watch band. 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 81.229 knurled link pin kit.