... the electrical wire or cable inside the bushing,and use screw tighten it,then it can fix on the mountingwhich make ... aesthetic tidiness,and also not get looseNormal wiring fix usedModelScrew hole diameter(ΦA)Center distance(B)Width(C)Length(L)ThicknessCable ... hole diameter(mm)cable hole diameter(in)Pcs/bagPcs/CtnKX-R3/164.49 ...