Ditch your old, worn out, or damaged Senco bits and replace them with Senco EA0123 #2 Square Duraspin Bit 2 Packs. The included bits feature a #2 square head and measure approximately 5 in. long. These bits are designed for use with the following Duraspin models: DS200-AC and DS202-14V, as well as the following Tyrex models: D400-AC and D404-14V.