SmartWedge shims are 100% polyethylene plastic, making them a practically indestructible product for installing doors and windows, for framing, and for deck building. Unlike wood shims, they are moisture-resistant and won’t swell, compress, or decay, and they will not split when fastened by nails or screws. The teeth on their faces interlock to hold them securely at the thickness you set. The standard shims are 8 inches long and 1 5/8 inches wide, but shims are also available in a range of widths and lengths. Prices start around $10 for a 30-pack.

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