Heavy-duty gate rollers built from solid rubber tire material and sturdy steel. The black-coated and hot-dip galvanized finish delivers high wear resistance, corrosion resistance, and rust resistance for durable outdoor use. Load capacity up to 227 kg. The 15.2 cm diameter wheels help prevent gate sag and reduce stress on hinges. The design places the wheel 21.6 cm from the bottom to the mid-mounted mast, providing up to 21.5 cm lift for your gate. Easy installation. Includes adjustable steel U-bolts for quick setup. Compatible with round gate tubes from 3.8 cm to 5.1 cm. Wheel diameter 15.2 cm and total length 25.4 cm. Please verify gate frame compatibility before purchase. Safe and reliable. Install the wheel on the bottom pipe of the gate and set to the desired height. Use the included washers and nuts to securely tighten the U-bolted yoke so the wheels stay in place and do not slip on the pipe. Use scenarios - Residential driveway gates to prevent sag and gate binding. - Barn or farm gates exposed to outdoor weather. - Perimeter fencing in outdoor environments with high traffic.