Description Two-Wire Staples Fasten 2 And 3 Conductor Non-Metallic Cable. SIZE: 1/2" X 1" - For 2 Conductor (No. 12 And No. 14) NM Cable. SIZE: 9/16" X 1-1/4" - For 3 Conductor (No. 10 And No. 12) NM, BX, UF And Other Cable.