Returning goods

On Saturday my husband & I went to Builders Warehouse to purchase some goods that we needed to complete a project. He is making clocks pieces of a tree that were recently cut down. We purchased a \Torkcraft expansive bit for wood". The reason we purchased this is because it was able to expand and the other implements were too small. Upon returning home my husband attempted to use the new tool & it did not work. We decided to return it as it did not work as required. On Sunday morning we returned to the store. Bryan was requested to assist us. He explained that this product was not for trees but should only be used for timber as indicated on the product. I asked him what was wood if it was not timber"