THOMAS & BETTS ADR21-21 Connector, 2 Conductor. More details: Mechanical Connector, Type Two-Conductor, Head Style Slotted, Min. Conductor Size (AWG) 14 sol, Max. Conductor Size 2/0 AWG Stranded, Body Material Aluminum , Mount 1 Hole, Stud Size (In.) 1/4, Standards UL 486B Tested, AL9CU Rated