Product name:LM6UU Linear BearingProduct Features· Product Name : Linear Ball Bearing;Model : LM6UU· Material : Carbon Steel,Website: , Rubber;Inner Diameter : 6mm / 0.24"· Outer Diameter : 12mm / 0.47";Length : 19mm / 0.8"· Color : Silver Tone;Weight : 29gProduct DescriptionThe universal Ball Bearings is great for you to replace the damaged Ball Bearings in your devices to improve them efficiency and save energy.