Advanced Rocketry Kits and Components Loc Precision has rocket kits that are 1.6" to 7.5" in diameter. All Items Here are all the products in this category: • Tube Coupler 1.14 • Tube Coupler 1.52 • Tube Coupler 2.56 • Tube Coupler 2.56 • Tube Coupler 3.90 • 7.51 Tube Stiffner • 2.14 Bulkhead • Centering Rings 1.52 • Centering Ring 2.14 • Centering Rings 2.14 • Centering Ring 2.56 • Centering Ring 3.00 • Centering Ring 3.90