You are bidding on a used HPI Pioneer CAT40 3/16" End Mill Holder design for standard CAT40 spindles. This tool accepts 3/16" Weldon End Mills. This holder is coolant thru the center.
You are bidding on a used NIKKEN CAT50 1-1/4" Shell Mill Holder design for standard CAT50 spindles. This tool accepts 1-1/4" Shell Mills. Projection from spindle face is 90mm or 3.54".
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