【Super Load Capacity】: The office chair wheels are made of high-quality, thick and durable solid black nylon, and the bearings are strong and durable, which can replace cheap wheelchairs. 【Insert Stem Dimension】: Standard handle ring mounting stem (11 x 22 mm) to attach to most standard chair or stool bases, the right size can meet your needs，measure your size before purchasing. 【Practical Design】: The sliding design of a sturdy nylon frame can support the weight of most tables and chairs, workshop chairs or any other stools, etc. The black color can also easily match other chairs. 【Protect Your Floor】- The replacement hood slider has a soft rubber bottom to better protect your soft floor, and the package includes a felt pad to provide extra protection on the floor surface. 【Widely Used】: The height design of this bell-shaped office chair is similar to most standard chair wheels, which is suitable for most fixed desks or desks and chairs, saving money and protecting the floor. Features: These hood sliders have good traction and smooth action, they can remain stable on a smooth floor surface, such as wood, tile, etc. Although they provide more traction than casters. Safe and Easy to Install: These chair wheel stops Desk bells are easy to install, no tools required. But it also provides a safer seat for those who have difficulty getting in and out of chairs. Avoid injuries caused by the wheelchair. Specifications: Material: Nylon, Steel Color: Black Bottom: 2 inches / 50 mm wide Package Includes: 5 x Bells Note: Manual measurement may have small errors. Please check the size before placing an order. Small parts, please keep it away from children.