Description This item is used to convert swivel office chair with casters to a stationary chair without losing chair height. Universal to attach to almost all office chair bases. An excellent choice for office and home furnishings to reduce unwanted movement across hard, tile & laminate floors. Features -Color:Black. -Material: Iron, PU. -Size: About6.50X4.50X4.50cm/2.55X1.77X1.77in. - Similar to the height of most standard chair casters. Excellent for office and home furnishings -Used to convert a swivel office chair with casters to a fixed chair without reducing the height of the chair. -Reduce noise, prevents scratching of your floor surface and protects your expensive furniture when furniture is moved. -Just pull your old wheels out and use these stationary glides to convert a rolling chair to a stationary chair. -Can be used on wood, metal and tubular metal chairs, furniture and other equipment.Package list: 10 x chair stationary castors