Twin wheel styling at an affordable price. Black 2" diameter dual wheel for use with light to medium duty applications on all types of furniture. Hard nylon wheels for use on low to medium pile carpeting without padding. Weight rating 100 lbs per wheel. HOW TO SELECT CASTERS: 1) Remove caster from leg of chair base 2) Select the correct length and diameter - Tops of stems can be flat or rounded-either will fit 3) Determine if caster is to be used on chair mats, hard floors or carpeting. K Stem - for chair bases with 3/8" diameter wide opening for stem, up to 1" deep. Matte Black, Hard, 5/Set.