[Rust ]: heat vent covers floor 4x10inch are made of high-quality iron for ventilation systems; the floor grates is sprayed with a rust- pre-coat to keep your floor grille looking pristine in any environment. Rugged and construction ensures no bending or breaking. [Adjustable Floor Vent]: Through the vent register you can open or close the air outlet, or adjust the angle of the fan blade to achieve the ventilation effect you want. [Multi Application]: The 4x10inch floor register vents suitable for use on most floors, walls and ceilings, can be used in scenarios such as bedrooms, living rooms, kitchens, RV ventilation, etc. [Easy Installation] The dimension size provided in the specs for this air vent refers to the size of your duct opening, without any tools to install, after installation, gently attach the magnetic vent screen mesh to the vent, keep the floor air vent clean. Please note:the physical slightly color difference or difference, does not affect the use, please do not mind, thank you! Colour:Black Material:iron Package Contents: 2 * floor register vents 2 * magnetic vent mesh Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.