They absolutely do the job. They make chair movements quieter. Seem to conform to different style leg ends and stay on securely.
Pre-drill each leg with a 1/8 bit, then screw them on. It takes the longest to apply due to pre-drilling required, but worth the effort. Drill a pilot hole then screw in.
Unless you tap it perfect every time (big or small taps) they bend and are useless. Attempted to replace similar product with previous nail holes and still terrible. Scratches your floor when the felt wears off--which happens pretty quickly.
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