Secure parts onto shafts with ease of removal and replacement. This internal hair pin can hold multiple part shaft assemblies together and key parts onto shafts directly. A hole through the shaft for hair pin retention is required. There are ten 2 mm x 41 mm (3/32” x 1-5/8”) internal hair pins within each package. Constructed with zinc plating to give you a durable product and to help prevent corrosion.