(a.k.a., toe brake caster)
A toe-brake completely locks the caster wheels to prevent the chair from rolling. On a slick floor the chair can still slide if pushed, but it will not roll. In the unlocked position the casters roll easily. It's usually only necessary to lock 2 or 3 wheels to effectively stop a chair from rolling.
Available with hard tread for carpeted floors or soft tread for hardwood and tile floors.
Universal mounting stem11mm (1/3") diameter;19mm (3/4") long.
Standard chair casters in hard or soft tread are sold by many online retailers. Specialty chair casters and glides, e.g., in larger diameters, locking, braking (safety casters), industrial and ESD, can be hand-to-find. Give a Google search a try. You might get lucky.
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