Shims are used to fill small gaps or spaces between objects. They are used to support, adjust for better fit, or provide a level surface. Glazelock Tapered and Stackable Shimes are recycled plastic shims that are resilient and will resist splitting. They are waterproof and will not rot, shrink, or warp like wooden shims. Glazelock Wood Shims are most commonly used for window, door, trim, cabinet, countertop, and flooring installations. The Troxell Horseshoe Shims are made of hard plastic for minimal compression. These shims are ideal for marble and granite installation and are color-coded for easy installation.