Specifications1.high precision ; 2.strict quality control ; 3.competitive price ; 4.quickly delivery this feeder clamp can hold three runs of cables of 1/4", 3/8", 1/2", 7/8", 1-1/4, 1-5/8 it consists of two parts , one is stainless steel bracket , the other is clamp , made of Polypropyleneour clamp has passed professional test . Plastic Wall Attachment Kit