MK Machining Vortex Optics Polymer Throw Levers LOW PROFILE: Fits with any mounting setup. SIMPLE & QUICK SETUP: One piece construction, one bolt to tighten, and one minute installation on this vortex throw lever. DURABLE CONSTRUCTION: This MK Machining throw lever is made with nylon material to leave your scope unscratched. MADE IN USA: This MK throw lever is proudly manufactured in the US with a lifetime warranty. SIZE: Fits exactly to magnification ring dimensions. Read description below to ensure you purchase the correct size.