Fangrui Product Details 1. 5 Inch Gate Caster With Adjustable Spring Bracket Is Designed To Allow Gates To Open And Close Freely. 2. It Features A 100kg Load Rating And A Spring-loaded Clamp That Acts As A When The Caster Is Rolling Over Rough Or Uneven Surfaces. 3. It Also Features A Universal Mount For Wood Or Metal Gates. 4. Heavy Duty Spring-loaded Gate Casters Adjust With Surrounding Terrain To Maintain Gate Height Throughout The Opening And Closing Cycles. 5. These Rotating Supports Work Equally Well On Level And Uneven Exterior Surfaces Such As Asphalt, Brick, Concrete, Dirt, Grass, Gravel And Pavers. Colour:black Material:metal + Rubber Size:310 X 130mm Package Contents: 1 X Gate Caster Door Wheel 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.