Senco EA0127#2 Square Drive Bits 2 Pk. - Duraspin Screw Fastening System Duraspin Senco Replacement Parts Made with Steel to Hold up in Demanding Applications Compatible with Duraspin Models: DS300-S2 and DS300 For Use with Tyrex Models: D600-2 and D600-ATT Includes: (2) #2 Square Drive Bits