Vortex's Precision Diving Board Mount (30mm) - Designed for Compatibility! The Precision Diving Board Mount (30mm) by Vortex is expertly crafted to seamlessly work with Vortex PMR Rings and Precision Extended Cantilever Mounts. It is specifically engineered for compatibility with Vortex's Impact 4000 Ballistic Rail-Mounted Laser Rangefinder. Notably, please be aware that this product includes the top half of the ring only. The bottom half of the ring is not included. Product Specifications Manufacturer: Vortex Model: PMR-DB-30 Tube Size: 30mm Height: 1.36" (Height above scope) Weight: 2.1 oz Mount Type: Picatinny Additional Features: Comes with T-25 Torx Wrench and (4) T-25 Torx Screws