You are bidding on a used HPI Pioneer CAT50 1" End Mill Holder design for standard CAT50 spindles. This tool accepts 1" Weldon End Mills. This holder is coolant thru the center and DIN AD/B flange coolant. Projection from spindle face is 4.00".
In original packaging, this is a holder only. Please order retention knobs separately. These items are available upon request.