HSS ADJUSTABLE ROUND DIES - 1.1/2 INCH O.D - 3/4 X 10 UNC - ALPS
https://www.toolsnsafety.com/shop/hss-adjustable-round-dies-1-1-2-inch-o-d-3-4-x-10-unc-alps-4383
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High Speed Steel Adjustable Round Dies UNC