1 Inch Scope Medium Weaver Picatinny Mount Ring 21mm Base

Specifications:
Tube Diameter: 25mm / 1 Inch
Attaches to Rail: Picatinny/Weaver 
Height: Medium

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

Height (from bottom to ring center): 26mm (1.023 inch)
OR
Height (from bottom to ring center): 25.4mm (1 inch)