HSS ADJUSTABLE ROUND DIES - 1.1/2 INCH O.D - 1/2 X 13 UNC - ALPS
https://www.toolsnsafety.com/shop/hss-adjustable-round-dies-1-1-2-inch-o-d-1-2-x-13-unc-alps-4381
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High Speed Steel Adjustable Round Dies UNC