Loose Washer Black Phosphate Finish Sheet Metal Screw 4.2 ? 1.41 x 20mm, 7mm Indented Hex Head, 17mm O.D. GM # 11503892 25ct. Loose Washer Black Phosphate Finish Sheet Metal Screw 4.2 ? 1.41 x 20mm, 7mm Indented Hex Head, 17mm O.D. GM # 11503892 25ct. MI802-25