Replacement model: N250759, 330075-73 330075-74 it includding N472497 replacement drill chuck and a1/4"-28 Left Hand Chuck Screw N092854 for easy to mount For Dewalt DC725A,DCD775KL,DCD775B,DCD771C2,DCD771,DCD777C2,DCD771C2 ,DCD776C2-AR ,DCD776C2-B2,DCD776C2-B3,DCD776C2-BR ,DCD778D2-AR,DCD778D2-B2,DCD778D2-B3,DCD778L1.