This kit includes all our specialty hardware you need to build a small treehouse platform in 3 trees. Typically about 70-120 square feet in platform size. Kit includes: 4 CoreTAB Powder coated4 TAB Nut 1-1/4"-12 Zinc plated steel2 Universal Floating Bracket2 1.25" Pipe Bracket16 5/16" x 4" RSS screws by GRK Fasteners1 Star Drive T30 Bit Downloadable CAD drawn detail page showing a standard 3 tree layout. (Please note that this is not a full set of plans as all 3 tree configurations will differ) If you are unsure that your tree configuration will work with this hardware kit, please email us and we will make recommendations. NOTE: Sizes are approximate and every situation is different, so if you are unsure of which kit to order - please email us for more information. The single trees will need to be a minimum of 12" in diameter and the tree with the double connection will need to be a minimum of 16" in diameter. Note: The number of supports under our platforms will vary depending on the size kit you choose.