Bumper is made of 3/16 steel, that is laser cut and formed. It has a drop down deck in it to allow the rear tire to be mounted lower. It has a built in 2" receiver. The tire carrier mounts to our spindle that has been in use for years with great success. The tire carrier, carries a 37" tire with no problems or rattles. It will carry a 48" HiLift as shown in the picture. Tire carrier opens very easily. It uses a bear claw latch very similar to a car door latch, gentle pull release lever the unit unlocks and is ready to open. Tire Carrier is constructed of 1.75" ERW tubing.