High-Quality Material： Our replacement wheels are made of a combination of hard PP shell, metal bearings, reinforced rivets, very strong and durable Suitable for All Kinds of Terrain： Our tool wheel is 4.7 inches in diameter, which can roll easily on gravel roads, muddy roads, etc., all kinds of uneven surfaces Easy to Install： No special tools needed, just a screwdriver to install easily, usually just align the holes and tighten the screws What You Will Get：4.7" 2 Casters & 2 Spacers, 6 Screws, 2 Nuts Perfect After-Sales：We are wheel is not suitable for other products, if you need to install it on other products, you can confirm the size or contact us in advance, we will reply 24 hours your message MARUTAI is a specialty manufacturer of tool bags