Internal Fit: Out of sight....invisible! Universal: Fits most drains if it fits physically it is compatible with your drain Precision Engineered: Flat on one side to catch hair and debris, round on other side to increase water flow. Easy to replace, no mess, no fuss, no hassle! Shower Drains Only. Not Compatible with Tub Drains. -Disposable Internal Hair Trap Designed to fit under the drain cover. -Out of the way, out of sight...invisible. -Replace every 1-2 months. (This package is a 1-2 year supply) -Remove your drain cover, dispose the hair catcher, no mess, no fuss. Replace with a new Hair Trap. -Universal Design fits nearly all drains. If the waste pipe is too big and the trap will fall in the waste pipe it won't work. If it fits, it works. (2.75in Diameter) -Shower Hair Trap only, not compatible with Tub Drains.