The Vortex 30mm Low Riflescope Rings Mount on Picatinny or Weaver Type Rails - Positioning the Riflescope 0.75 Inches (19mm) From Base to Center - 30MRNG-L Made from aircraft-grade 6061-T6 aluminum for optimum strength. Tighten rail mount bolt to 35 inch pounds. Tighten scope ring fasteners to 22 inch pounds.
