The Aeroflow Performance hand held pipe beading tool isa great tool to attach your hose with no leaks. They produce a properly positioned and perfectly radiused bead on aluminium tubing. Especially when it comes to making custom fuel lines and wanting to keep the hose from slipping off. They are crafted from heat treated steel and great for beading 7.94mm (5/16”), 9.52mm (3/8”) and 12.7mm(1/2”) pipe. Simply insert the tool inside the tubing and start turning the tool slowly to create a bead.