TruGlo Picatinny-Style Riser Mount .5 Inch Rise Approximately 4 Inches Long TG. This mount is simple to install without the need for modification. The mount may be used with red dot sights and is ideal for use with scopes. The piece will fit any AR-15 flattop and will raise the mounting platform by a half an inch. The length of this mount is about 4 inches. The design will maximize strength and stability for your scope. Specifications for TruGlo Picatinny-Style Riser Mount: Manufacturer: TruGlo Red Dot Sights-Footprint: Not Applicable Optic Cut: Not Applicable Package Contents: TruGlo Picatinny-Style Riser Mount TruGlo TG-TG8970B: Picatinny-Style Riser Mount .5 Inch Rise Approximately 4 Inches Long