Amana Tool 49524 R: 1-1/4" D: 3" B: 1-1/2" d: 1/2" L: 3-1/4" Max 10,000 RPM. Not guaranteed due to extreme dia. and radius. For best results it is recommended to use a smaller radius bit or chamfer the material prior to using these large radius tools. Tool life will be prolonged and a smoother finish will result.