B-Line Twirl nut features steel construction with electro-plated zinc/ASTM B633 SC3 Type III or ASTM A653 finish for added corrosion and longer endurance. It has thread size of 1/4 - 20. This 1/4-Inch nut is suitable for use on B11, B12, B22, B24, B26, B32, B42, B52, B54 and B56 channel.