• Standard hex key and tube cutters are all the tools you need • Create tubular frames without welding, threading, bolting or drilling • All you need for a cost-effective, versatile and simple way to design and assemble load-bearing indoor and outdoor structures quickly and easily • Precut pipe is easily fitted and locked in • Galvanized, corrosion-resistant • A cost-effective alternative to welding • Strong and easy to assemble • Fitting base is 4-1/4 across and 4 high • Top of fitting for pipe is 2-1/2 across and 1-3/4 thick for pipe