PREMIUM QUALITY 304 STAINLESS STEEL MATERIAL: Made of 304 stainless steel, no screwing or hassle, rustproof and durable, buy one and use it forever. Unique Water Sensor Design: 64 water catchment holes, effectively block water flow and do not block drainage. Including keys, rings, hairs, etc. EASY TO USE AND CLEAN: Simply place it in the drain and after a few days the debris can be easily wiped away. PERFECT SIZE: With a diameter of 1.81" (46mm) and a height of 1.22" (31mm), it fits all standard bathtub drains. Scope of delivery: 4 sewer floor drains