Special screw mount brackets clasp to VERTICAL wood balusters or "spires" on decks, fences and porches. Fits 1" to 1-1/2" square ballusters / spires. It's perfect for birdfeeders or hanging baskets. The bracket extends out 2-1/2" from spire. Hang point is 32" above hand rail, and 14" out from hand rail. The brackets are made with specially formed 1/8" thick plate which provides "IRON CLAD" holding power for extreme 30# capacity - and importantly - are very easy to install with just a screw driver! Powder coated 7/16" square steel. Made in USA.