Thread size: 2 1/2-4 NPT141 threads 2 1/2 in, 3 in, 3 1/2 in, 4 in pipe with one set of diesJaw clutch prevents jammingEachThread size: 2 1/2-4 NPT141 threads 2 1/2 in, 3 in, 3 1/2 in, 4 in pipe with one set of diesJaw clutch prevents jammingRidgid® 141 Geared Receding Threader, 2 1/2-4 NPThttp://s7d5.scene7.com/is/image/Staples/s0482489_sc7?$std$http://s7d5.scene7.com/is/image/Staples/s0482489_sc7?$thb$http://www.staples.com/sbd/img/res/ic/ic016-deliveryreq.gifhttp://s7d5.scene7.com/is/image/Staples/s0482489/Ridgid-141-Geared-Receding-Threader-2-1-2-4-NPT/product_770841Ridgid® 141 Geared Receding Threader, 2 1/2-4 NPT0.00