Hight impact plastic tapered shims come prescored, eliminating the need for you to manually cut or score each shim. Quickly get the right size you need while saving time. These shims are designed with a unique gripping system which allows the ridges to securely lock into place. The tapered edge can easily be inserted into a gap when aligning door frames, windows and working with drywall. Glazelock's plastic tapered shims will not rot, crack, warp, swell or split in wet, hot or cold environments. Based in Kankakee, IL, USA, Glazelock designs and manufactures wood and high impact plastic shims for both professional installers and the do-it-yourselfers.