Patented New Features--Only Available from TheCopperMine TM: * Output Limiter: Separate copper&jacket when pulling the wire thru,all in 1 stroke. Double work speed * Input Guide: Wire gets straightened and aligned automatically. Good for kinked or tangled wires. * EZ Start Cutter: Get the copper out quick & easy after the insulation is slit * Blade Sharpening Jig: Restore dull blade in seconds.Jig sets the precise angles for easy sharpening.