The product is an ideal set for avid spearfishermen. It is composed of the crimping tool and 3 types of multifilament for different purposes. The multi-filament is made of a resistant material, capable of resisting high forces. The multifilaments are in different diameters, 1.6, 1.8, and 2 millimeters, each 25 feet • 7,6 meters long. For each multifilament 6 crimps are available. A crimping tool feature for spearguns line is a device used to secure the end of the line onto a spear shaft. It works by using two jaws that are pressed together, with one jaw containing teeth and the other having grooves that match up with those teeth. The user then slides the line through these grooves and presses down on both jaws simultaneously in order to create a tight connection between the line and spear shaft. This ensures that there is no slipping or fraying of the line during use, which can be dangerous if it comes loose while hunting underwater. It features 4 crimping sizes, from 0.1 up to 2.2 mm. Two blade cutters are included on the head for trimming the line. The tool is made of high-carbon steel for durability, these crimpers are ideal for rigging your speargun. Comfortable and non-slip handle. The Crimping Tool Set is designed in Italy by Cressi and made in China. Cressi has been an Italian brand pioneer in scuba diving, snorkeling, and swimming equipment since 1946. The product is covered by a 2-year limited warranty.