440 - O Grooved Double Bearing Wheel With Grease Cup

These wheels requires a a type of housing to hold the wheel. They are sold as seen in the image. Wheel bolt and nut is included. Two different sizes are available as listed below. Groove size is 20mm for all variants.

A sliding gate, also known as a slide gate, is a type of gate that operates by sliding horizontally to open or close an entrance. Unlike swing gates that pivot on hinges to open inward or outward, sliding gates move along a track on the ground. The gate is typically supported by bottom wheels and guide rollers (Nylon ), allowing it to slide smoothly along the track .