Rx Series Ergonomic Precision Pliers * Adjustable Handle Spring * ESD-Safe Grips Cutters and pliers are made from an advanced forging with carbon-chrome ball-bearing steel and have a cutting edge hardness of 63-65 Rockwell C. The precision ground joint and adjustable screw-nut assures uniform wear without "play" for the life of the tool. An adjustable handle spring and a series of vertical ports allows you to change the width and tension of the tool to fit your individual physical requirements. The ergonomic handle is slightly rounded and wide, creating excellent surface distribution. These tools are ideal for repetitive work as less force is needed during cutting. Long Nose Pliers Model RX7890 has smooth jaws. Model RX7891 has serrated jaws. Part No. Model A B 401-447 RX7890 6.3" 1.26" 401-456 RX7891 6.3" 1.26"