Answer
Apr 23, 2015 - 11:05 AM
Is sounds like you need K-Stem casters, but you should match the length and diameter of your stem to the diagram below.
To determine the length, you only need to measure the part of the stem exposed above the wheel. It doesn't matter whether your current casters have rounded or flat tops. As long as the length and diameter are the same, the new casters will fit your chair.
You can shop our dual wheel, K-Stem casters for chair mats here.