The R-750C has a ratchet mechanism that has been designed to withstand the stress of 750 MCM copper and aluminum cables with a maximum O.D. of 1-3/4.” The blades have a 100% cutting surface which provides the best possible cutting leverage. A thumb release lever allows the operator to back out of a cut when necessary. A locking mechanism closes the handles for easy storage.; NOTE: DO NOT CUT STEEL.