Weaver Tactical Rings feature 6 screws for maximum security. Constructed of aluminum, these rings are designed to withstand grueling use in any environments. CHOOSING RING Ring height is determined by measuring the outside objective (bell) diameter. Made from Top Quality material Weaver Tactical Rings feature 6 screws for maximum security. Constructed of aluminum, these rings are designed to withstand grueling use in any environments. CHOOSING RING Ring height is determined by measuring the outside objective ( bell) diameter on your scope. Features Material - Aluminum. Color - Matte. Hole - 6. Size - 30 mm. Medium.