Glazelock wood shims are designed with a tapered edge so they can be easily inserted into a gap when aligning door frames, windows and working with drywall. Made with 100% kiln dried wood for durable performance and are trusted by professional contractors to level algin joists, doors, counters, sheetrock, furniture and much more. Made in Kankakee, IL, USA, Glazelock designs and manufactures wood and plastic shims for both professional installers and the do-it-yourselfers.