Upgrade your sliding screen doors and windows with these reliable and sturdy rollers. Constructed from stainless steel and copper, they are built to withstand daily use and harsh weather conditions. These rollers are ideal for ensuring your doors and windows operate smoothly, making them an essential component for any home or office. Features -Color:Multi -Material:Stainless steel, copper -Size:4.00X1.20X1.00cm/1.57X0.47X0.39in -Wheel diameter: 12 mm -Hole spacing: 30 mm -Reliable stainless steel: these rollers are made from reliable material, offering exceptional durability and resistance to wear -Lightweight wheels: the metal wheels are lightweight, making them easy to push and pull, improving the ease of use -Stable movement: the roller design ensures stable and smooth movement, reducing friction and noise for a quieter operation -Wide compatibility: suitable for use with both screen doors and windows, these rollers are versatile and easy to install -Noise and friction reduction: designed to minimize noise and friction, these rollers provide a quieter and more comfortable environment Package list: 4 x pulley wheels 8 x screws