These are heavy duty plastic shims used for leveling the slate quickly and easily. Each shim is flat on the bottom and ribbed on both sides to lock the shim in place. Comes in sets of 12. Each one measures about 3x1-1/4x5/16.
You can return the item unused within 30 days for a full refund of the purchase price. No returns, refunds, or cancellations will be accepted on customized items, except in the case of damage or defects. If you should encounter a damaged or defective product, contact customer service within 15 days of receipt.