• ◆Quality material: Bell glides office chair replacement wheels are made of high-quality solid black nylon and thick, durable steel bolts, with heat resistance, wear resistance, chemical resistance, and self-lubricity, which can maintain a quiet atmosphere. • ◆Bell sliders size: swivel wheels for office chairs, the base diameter is 50 mm and the grip ring mounting stem of 11 mm * 20 mm to attach to most standard chair or stool bases. The right size can meet your needs. • ◆Features: Fixed stationary wheels make the chair stop, but it is easier to move than the sliding cover without cushions, the black color can also easily match different chairs, swivel wheels for office chairs are an excellent choice for the office and home. • ◆Easy to use: Bell slides replacement office chair wheels without the need for other tools, remove the old wheel from the bottom of the chair, remove the new sliding bar from the foot seat and then push it until it is firmly seated • ◆Perfect for commercial office: swivel wheels for office chairs are perfect for home or commercial offices, durable and reliable for many years of use. They can be used as stationary wheels on wooden chairs, metal chairs, and metal tubular chairs. • Dimensions (Length x Width x Height cm, Weight g): 16 x 14 x 5.2, 345