B stem safety casters feature an oversized 7/16in. neck for smooth chair rolling while seated. Built-in brake prevents wheels from rolling freely when you stand. Use soft wheels on hard floors and chairmats. Design includes nylon construction, chromed metal stems, 2-3/8in. diameter dual wheels and 1-3/8in. hoods. Lorell Soft Wheel B Stem Oversized Safety Casters - 1.97in. Diameter - Nylon, Metal - Black is one of many available through Office Depot. Made by Lorell.
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