Dual Rated Solderless Connector, wire range 1000 AWG - 500 AWG. TYPE: 2AB/2AB2.The unique ridges formed on the bottom of the contact surface aredesigned to provide contact points for an electrically secure jointof the lowest resistance for current flow.The screws used to clamp the conductors are designed to extend beyond the barrel sides of the conductor to allow a better, more secure compression of the conductor.