Sapim Double Square SL Alloy Nipple Description: These Sapim Double Square SL Alloy Nipples are specially profiled for use with wheel truing machines. A double square shape enables access for tensioning from internal spaces, reducing wear on visible portions of the nipple. Features: Allows for truing and tensioning of wheel using internal or external wrenches Polyax design features a round shape of the head that works like a ball joint between the rim and nipple, ensuring a better spoke/nipple line Aluminum SL: 7075-T6 aluminum, special coating on thread and nipple surface to further reduce corrosion and reduce friction between spoke/nipple and nipple/rim Secure Lock prevents nipples from loosening via a mechanical means instead of a thread locking compound or paste Specifications: Color: Silver Gauge: 14g Length: 16mm Material: 7075-T6 Aluminum