What are the 'actual' wood post dimensions that this will mount to? Lumber dimensions are a bit misleading. When the board is first rough cut from the log, it is to the true measurement, such as a 4" x 4", 4" x 6" or a 6" x 6" post. However, the drying process and planning of the board reduces it to its finished dimensions. For example, our reference to a 4"x 6" post, is actually a 3-1/2" x 5-1/2" post. This wood post kit is designed to mount our wall mount hose reel (Model 1041) to any post whose exact width is either 3-1/2" or 5-1/2". Can I dig an 8-inch hole instead of a 12-inch one for the wood post? We have taken the recommendations of the concrete manufacturers on the recommended hole size.  There must be enough concrete from the corner of the post to the edge of the hole.  A 4 x 4 post in an 8-inch hole would only give 1-1/2 inches of concrete.  Freeze-thaw cycles and loads on the post could easily crack that thin of material.  Visit the QUICKRETE website for more details and an informative video on Setting Posts in Concrete.    What size is the mounting hardware that comes with this kit? All hardware supplied with this kit is stainless steel.  Each of the four (4) wood lag screws for attaching the brackets to the wood post include 1/4-inch x 2-inch hex head wood screws and a 1/4-inch flat washer.  Each of the four (4) screws used for attaching the reel's wall plate to the wood post brackets include an M6 x 25 hex socket head screw, a 1/4-inch flat washer, and an M6 serrated flange nut.