... alloy size: 13x31, 13x42, ,14x28,14x38 15x33.. drive anchor Zinc Aloy Easy Drive Anchor/Speed Anchor Material: zinc alloy size: 13x31, 13x42, ,14x28 ... pipe air-conditioner and exhaust duct,panel wall3.applicable parent metal:concrete and thick natural stone4.presembled for quick and easy ...