FITS: 4" round chain link fence post and 2.5" round gate frames WHEEL SIZE: 6" COMMERCIAL/ INDUSTRY: The perfect addition for factories, businesses, etc. that would like to any easy way to open their gate system PACK SIZE: 4 rollers Bolts included Cantilever rollers are often used for large sliding pipe gates or chain link fence gates. For best use, four cantilever rollers are needed per gate (two on top and two on the bottom) to ensure a smooth open and close. SIZING AND FEATURES: - Fits 4" round posts - Fits 2.5" round gate frame - Wheel size is 6" - Shaft size is 7/8" hardened steel - Pack size is 4 rollers - Bolts are included COMMERCIAL/ INDUSTRY USE - Perfect for factories or businesses that would like to add a smoother system to their property gates. - Will allow for a seamless open and close for chain link fence gates