Includes 6 suppressor alignment rods. Set supports multiple calibers. Safely check for concentricity w/o barrel damage. Precise durable and lightweight. Rods are within 0.003″ straightness tolerances. 1. OD11.1 Rod: Length:13.89″ Outer Diameter:0.44″ Inner Diameter:0.44″ Weight:0.42oz. 2. OD8.6 Rod: Length: 13.89″ Outer Diameter:0.34″ Inner Diameter:0.34″ Weight:0.24oz. 3. OD8.2 Rod: Length:13.89″ Outer Diameter:0.32″ Inner Diameter:0.32″ Weight: 0.13oz. 4. OD7.5 Rod: Length:13.89″ Outer Diameter:0.30″ Inner Diameter:0.30″ Weight: 0.27oz. 5. OD6.3 Rod: Length:13.89″ Outer Diameter:0.25″ Inner Diameter:0.25″ Weight: 0.34oz. 6. OD5.4 Rod: Length:13.89″ Outer Diameter:0.22″ Inner Diameter:0.22″ Weight: 1.19oz.