This National Velvet Reduction Drive with Millen Knobs and Black 180 Degree Scale, is used and in excellent condition with a very nice ceramic coupler which will accept a 1/4 inch shaft.NOTE:This piece of equipment is a consignment item I am selling for the family of a silent key who recently passed away. This item is being sold as is, as described. This unit is beautiful and perfect for an air variable capacitor.