Perfectly suited for multiple glass thicknesses This combination kit includes two sets of sliding shower door bottom tracks: one set for 7/16-inch thick shower glass doors and another for 5/16-inch thick doors, compatible with 1/2-inch and 3/8-inch track slots. Durable & Long-Lasting Materials Both guides are made from premium white plastic, designed to resist wear and tear. Their low friction coefficients and wear-resistant properties ensure smooth, quiet operation and extended service life. Easy Installation – No Special Tools Required Installing these shower door guides is quick and hassle-free. The white guide is 3 inches long with a 1/2-inch channel, while the transparent guide is 2 inches long with a 0.4-inch channel. Both are designed for straightforward assembly, saving you time and effort. Enhanced Stability & Quiet Operation These guides keep your shower doors properly aligned, reducing vibrations and noise. The white guide features excellent sound-dampening effects, making it ideal for quiet environments, while the transparent guide ensures smooth sliding for both doors. Versatile & Space-Saving Design Compact and efficient, these guides take up minimal space while providing maximum functionality. Whether you need a replacement part or a new installation, this combo pack offers a cost-effective solution for maintaining or upgrading your shower door system.