Shower door plastic track dimensions: 1/2-inch track × 7/16-inch glass. Our inner groove dimensions are 0.52 inches, designed explicitly for 7/16-inch glass. Not suitable for glass thicker than 7/16 inches. The appropriate dimensions will not take up too much of your time or space. Compatibility Note: Fits shower glass doors that are 7/16 inch thick. If you are unsure of the glass type, please measure the glass thickness with a caliper before making a purchase. Easy to Install: This glass shower door lower rail assembly is used to keep the shower door properly aligned. No special tools or skills are required. The sliding shower door bathtub enclosure, made of an extruded metal frame, is very easy to install together. Material: The glass shower door hardware is a grey plastic structure, made of high-quality material that is not easily damaged, offering a long service life. Good Friction and Wear Characteristics: The sliding shower door bottom rail features a plastic material with low static and dynamic coefficients of friction, making it wear-resistant. This helps to extend the service life of the guide. Easy to Use: This is the best alternative to glass shower door rail components. It is easy to install, dampens vibrations, and has sound sound-dampening effects. It also runs quieter, making it ideal for use in quiet environments, such as showers. Shower door plastic track dimensions: 1/2-inch track × 7/16-inch glass. Our inner groove dimensions are 0.52 inches, designed explicitly for 7/16-inch glass. Not suitable for glass thicker than 7/16 inches. The appropriate dimensions will not take up too much of your time or space. Compatibility Note: Fits shower glass doors that are 7/16 inch thick. If you are unsure of the glass type, please measure the glass thickness with a caliper before making a purchase. Easy to Install: This glass shower door lower rail assembly is used to keep the shower door properly aligned. No special tools or skills are required. The sliding shower door bathtub enclosure, made of an extruded metal frame, is very easy to install together. Material: The glass shower door hardware is a grey plastic structure, made of high-quality material that is resistant to damage, offering a long service life. Good Friction and Wear Characteristics: The sliding shower door bottom rail features a plastic material with low static and dynamic coefficients of friction, making it wear-resistant. This helps to extend the service life of the guide. Easy to Use: This is the best alternative to glass shower door rail components. It is easy to install, dampens vibrations, and has sound sound-dampening effects. It also runs quieter, making it ideal for use in quiet environments, such as showers.