This grips fits the below "D" frame revolvers that are made after 1966. Steel Frame Revolvers (Serial #D900101 and above) a fa Colt Detective Special a fa Diamondback a fa DSII a fa Lady Special a fa Magnum carry a fa Police Positive Special a fa SF-VI Lightweight Aluminum Frame Revolvers (Serial #200101LW and above) a fa Agent a fa Cobra a fa King Cobra a fa Viper Will NOT fit pre-1966 models with longer grip frame that has rounded bottom corners. Verify your frame by measuring distance from rear sideplate screw to grip stock-pin. Older/longer frame is approx. 3 1/4", while the newer/short frame is approx. 2 5/8".