The Eckel 3500 DTT (Dual Tubing Tong) provides fast, easy running on dual strings of 3-1/2 inch or smaller tubing. It grabs from the side, or head-on. Go ahead and torque it up; this tong is Eckel tough. And speed shifts are no problem, thanks to a patented Hydra-Shift concept that eliminates clutching. The Model 3500 DTT Hydra-Shift is packed with all the features you've come to expect from Eckel: patented cam biting system, quick-change sliding heads, self-aligning open throat.