This is a Black Plastic buttplate Marlin models 39, 80, 81, 42a and model 56 lever action .22 rifle. It is a reproduction of an original buttplate made from high quality urethane. Your buttplate comes with fitting instructions, as some minor fitting MAY be required, but not always. Dimensions are as follows; Overall length is 4 5/8 inches; width at widest point is 1 1/2 inches. From top to the middle of the top screw hole is 3/4 of an inch and bottom of plate to middle of bottom screw hole is 1 1/4 inch. Center to center of screw holes is approx 2 3/4 inches (If the overall length and width are too small for what you need then go with the over sized buttplate. The screw holes are located in the same place part number 820. Use buttplate screws wp57 (make sure you measure your stock to make sure that this is the correct buttplate. The model 39 uses different plates, see other buttplates on the website).