MATERIAL: Roller is made of high quality matrial, with post welded bracket, strong and , greasing or maintenance can be saved SMOOTH 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 easily 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 colour: White Material: Nylon + stainless steel size: 60x40x50mm Package Contents: 6 x Slide Gate Guide Rollers Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.