The 1 inch metal tubes press into the tires. This two stand kit came with no instructions. The threaded holes for the knob adjusters needed to be chased with a bolt and wrench. Study the photo on the advertisement to assist in assembly. Use quaility wrenches, the provided wrenches are not user friendly. Be aware the ad may not be accurate depiction of contents in box. Install axle bolts with nut on outside of stand, away from the motorcycle tire. Wear motorcycle gear to facilitate assembly 😉 The Ebay ad photo for this kit did not show the tube supports (laying on box). This kit came with a deformed washer which was cut in half (see box and ?!) If you have to replace parts (washer) find one which is similar. Enlist a mechanic helper. Spring and cotter pin assembly. The curved metal braces will mount on the outside of the black tubing. Note in the top of the screen: The axle bolt had to be turned around, sharp edges (bolt) not recommended to face tire. Real wrenches finally added to the project. Do this at the beginning. The provided wrenches were circular container worthy. “MJOLNIR” K9 did not want to help, found a replacement mechanic helper.