GDW - Golf Graphite Shaft Extender STD .600 New Stronger Durable and Lighter Design - .485" insertion .600"OD Extend Graphite Golf Shafts up to 3 inches Military grade nylon plastic with fiber reinforced material Specially engineered epoxy bonding pillars for Strong Epoxy Adhesion Easy to Install - Superior Quality and Design - MADE IN U.S.A.