none is needed: simply turn the handle to open / close, and a small latches can be added for outward-opening invisible doors, boosting practicality Crafted from 304 stainless steel, this Round Recessed Door great rust resistance Great for high-humidity areas like bathrooms or kitchens It has double sided rotatable handles that tuck into the knob ’ s center when not in use, keeping a clean, minimalist look It resists fading, maintains a smooth, comfortable touch, and withstands daily wear without structural damage, ensuring long term reliability and a sleek silver finish that complements any door decoration Featuring a flush mounted recessed design, the door handle sits perfectly with the door panel—none rubbing against the frame This hidden works for living rooms, bedrooms, bathrooms, kitchens, balconies, and passageways, Manufacturer: Whoasyst