This tire swivel has 3 prongs to help prevent chains from tangling. Our extra heavy duty commercial tire swivel has a top plate for added strength and a rubber boot to prevent fingers from being pinched. The top plate has four holes for attaching to a wood beam. The four 7/16" holes are center to center. The plate is overall 5.5" long and 5.5" wide. The entire swivel is 9" long. Holes are round not oblong. Powder coated in a bright red finish.
Place top plate on top of wood frame and swivel under the beam. Use correct size carriage bolts for the size of wood and nuts with lock tight and attach snugly. (Bolts and nuts are not included.) You will need to use S-hooks or shackles from the chain to the swivel. Make sure the S-hooks are closed to within .04 to meet ASTM safety standards. To do this you will need to use our S-hook pliers or a regular pair of channel lock pliers. WARNING: Once the S-hooks have been opened they will have to be replaced to avoid injuries from coming open and/or breaking. Make sure that if you are using shackles they are also tightened.