Grade R Twin Line Welding Hose, 3 8 in x 100 ft, BB Fittings, Acetylene and Oxygen no checkout For spreading and leveling gravel One piece For spreading and leveling gravel One piece forged head has extra heavy One piece Y shaped body design with magnetic legs Built in dial with 2 1 2° increments that turns 360° Hardened center punch marks set position by taping with a hammer Used to establish and mark a centerline at any angle around circumference on a pipe or tank or as a protractor level Excessive heat can damage magnets High quality Grade R twin line welding hoses Green hose carries oxygen to welding equipment Red hose carries acetylene Hose cover resists oils