37? DOUBLE FLARING ADAPTERS in 3/16″, 1/4″, 5/16″, 3/8″, 1/2 sizes. 37? DOUBLE FLARE DIE SETS in 3/16″, 1/4″, 5/16″, 3/8″, 1/2 sizes. 37? CONE constructed of high quality machined steel. CREATE PERFECT PRODUCTION QUALITY FLARES on annealed stainless steel tubing, terne plate steel tubing, soft aluminum and soft copper tubing. PRIMARY USES INCLUDE racing, restoration, hot rods, aviation.