BCP 1 Piece Thread Screw Pitch Gauge , Measuering Tool , MM & SAE (Silver Color) Fit for : Whitworth 55-Degree Threads & Metric 60-Degree Threads. Whitworth 55-Degree: 4G4-1/2G5G6G7G8G9G10G11G12G14G16G18G19G20G22G,24G,28G,40G,48G. Metric 60-Degree 0.50.60.70.750.80.91.01.25, 1.51.752.02.53.03.54.04.55.05.56.06.5, 7.0 Becuase the tool is spreaded with rust preventing oil, please clean it when using. Package : 1 x Screw Pitch Gauge