Reed's SD81-4 is a Solid Die, Adjustable Guide Threader Set. It has a 1/2" - 1" capacity. It weighs 6.8 lbs. This set of full-range block dies is the most economical, most convenient, and most versatile threader set on the market. This set works well on coated pipe because the diehead can fit over the coating and then be tightened down into place. These block dies may be used as pipe thread chasers.