Flares all standard sizes of soft copper, brass or aluminum tubing Self-centering yoke of Shock Proof tempered malleable steel makes S.A.E 450 flare joints without splitting or cracking Hardened, super smooth cone swivels freely on ball bearings Large wing nuts permit easy, positive locking on the tubing Flares all standard sizes 3/16 in. - 5/8 in. O.D.; includes illustrated directions