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Clawfoot Tub Foot Draining Floor Coaster
This 90 mm floor coaster goes under a cast-iron clawfoot tub foot. Its 80 mm conical dish slopes from a 30 mm flat floor and centres any ball or claw foot with a 30–70 mm contact patch, so the foot can't scratch or rust-stain the tile or wood. Four 5 mm radial drain channels let shower splash run out of the dish instead of sitting around the iron, and the 3 mm solid floor spreads the tub's weight over 64 cm² of floor.
Office Chair Caster Parking Cup
This is an 80 mm dished floor cup that stops an office chair caster from rolling. It holds single or twin-wheel casters from 50 to 65 mm across and up to 26 mm wide in a 9 mm-deep bowl, so the chair stays put on hard floors at a desk or standing desk and the floor doesn't get scuffed. The body is 12 mm tall, the floor is 3 mm thick, and the rim is flat and sloped so a wheel rolls in with a nudge but won't roll out by itself.