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 smoothlyEASY 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 outGREAT FOR: heavy duty sliding entry gatescolour:WhiteMaterial:Nylon + stainless steelsize: 60x40x50mmPackage Contents:2 x Slide Gate Guide RollersOnly 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.