MATERIAL: Roller is made of high quality matrial, 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 move stably and smoothly EASY TO INSTALL: C-bracket is substantial and welds it to a support , the bolt beside the roller allows you to replace the roller when it's worn out GREAT FOR: heavy duty sliding entry gates colour: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 a little different from the real thing. The measurement allowed error is +/- 1-3cm.