Levi Innovations Classic Porch Swing Hanging Kit The (TWO) Green HANGERS are not plastic but stainless steel covered with plastic with 1500 lbs tested weight rating. Please use a Magnet to verify it. The hangers have steel where the eye hook is, which is where the strength needs to be, then it is molded over with 6/6 reinforced nylon coating to protect the steel against weather elements.L = 5.25" W= 2.00" H = 4.00" distance between 2 holes # 3 5/8" The Swing-Mate spring is a heavy-duty barrel shaped spring approximately 2 in diameter and 8-1/2 in length. It is zinc plated and clear coated to provide additional protection against the elements. Relax on the front or back yard, garden, pergola, a frame or patio swings seating set. This hardware provides added comfort to 4 5 or 6 foot porch swing seats. Simply connect the porch swing chain to the spring and enjoy! Steel barrel springs for cushion and iron hangers perfect plans for indoors or outdoors hanging chair swing MOUNTING HARDWARE NOT INCLUDED (ie. Screws, bolts, etc). enhance the comfort and use of hanging chairs, swings, tire swings and any number of hanging objects. . Ideal for cedar natural rollback fanback log bamboo wooden amish wicker cypress plastic porch swings, porch swing beds and posts easily to hammock chair swings.