MATERIAL: Roller is made of , with post welded bracket, strong and durable, greasing or maintenance can be saved MOVEMENT: Prevents the gate from tipping over from tracks and helps guide the sliding gate to move stably and smoothly EASY TO INSTALL: C-bracket is substantial and welds it to a support frame, the bolt beside the roller allows you to replace the roller when it's worn out GREAT FOR: heavy duty sliding entry gates Color: White Material: Nylon + stainless steel Size: 60x40x50mm Package Contents: 2 x Slide Gate Guide Rollers Only the above package content, other products are not included Note: Light and different displays may cause the color of the item in the picture to be slightly different from the real thing. The measurement allowed error is +/- 1-3cm.