If you're tired of struggling to move your heavy air compressor around, these PATIKIL wheels are an absolute game-changer! The 5.6-inch diameter provides good ground clearance and makes rolling over thresholds and rough surfaces much easier. The 0.7-inch mounting hole fits most standard air compressor axles, and they include the screw and nut you need for installation. Made from durable plastic, these wheels are strong enough to handle the weight of most home workshop compressors but still lightweight. Installation took me about 15 minutes - just line up the holes, insert the provided hardware, and tighten everything down. The difference in mobility is incredible - I can now easily move my compressor from my garage to the driveway or around my workshop without straining my back. They roll smoothly on concrete, asphalt, and even grass (within reason). The plastic construction holds up well and doesn't rust like some metal wheels can. Whether you're a DIYer who needs to move your compressor between projects or a professional who takes your compressor to job sites, these wheels make transportation so much easier. They're a simple, affordable upgrade that dramatically improves the functionality of your air compressor. Just remember to still use proper lifting technique for the main body - the wheels make moving easier, but they're not magic! Definitely one of the best $20 upgrades I've made to my workshop tools.