Highlight description:1. [Soft Rubber] Our furniture casters use soft rubber casters to guarantee no scratches or marks on the surface and easy to move.2. [Mounting Holes] The 5 horizontal mounting holes of the caster are used to fix the guide rail and are not smooth to deform. Increase the angle to make the mounting plate extra stable.Detailed description:SpecificationProduct name: Caster WheelsScope of application: industrial casters, electrical casters, furniture casters/office furniture/home/hardware14pcs 2inch:Material: PU+MetalColour: Black + OrangeSize: As ShownDiameter: 50mmMounting height: 73mmBearing: double bearingWheel width: 24mm16pcs 0.5inchMaterial: Polypropylene + Synthetic RubberWheel diameter: 12mm Wheel width: 9mm Load bearing: 8kg/17.6lb Installation height: 13mm Base plate size: 12.5×28mm Installation gap diameter: 20mm Installation hole: 4.2mm 4pcs:Product Size: 32mm (Diameter)Quantity: four PiecesParts List:14pcs 2inch:4 x 2 inch Caster Wheels 1 x Screwdriver sixteen x Screw Nuts sixteen x Screw Spacer16pcs 0.5inch16×Wheels 32×Screws 1×Screwdriver4pcs:4×Furniture Castors 1×Screwdriver 2×Screws Pack (20 Screws)Notes:1. Due to the adaptation between diverse monitors, the picture won't reflect the particular colour of the item.2. Please allow slight measurement distinction due to various manual measurement. Thank you to your understanding.