The Rhin-O-Tuff HD 4170 “Rhin-O-Roll” Coil Inserter Module has 12″ dual powered adjustable rollers for easier more accurate coil insertion. It has gauges for book thickness and coil sizing. The HD 4170 can be used as a stand-alone production coil inserter or it can be attached on any OD or HD Series machine. All pitches and diameters can be inserted using it. The HD 4170 comes with a crimper pliers holder. Rhin-O-Tuff plastic coil inserters are the most heavy duty manual coil binders in the industry.