30mm Scope Low Weaver Picatinny Mount Ring 21mm Base

Specifications:
Tube Diameter: 30mm
Attaches to Rail: Picatinny/Weaver 
Height: Low

Affordable Scope Mounts
High-durability Aluminum Alloy
Anodised Black for a Great Finish.

Height (from bottom to ring center): 24mm (0.94 inch)
OR
Height (from bottom to ring center): 25.4mm (1 inch)