MK Machining Burris Polymer Throw Levers MADE IN USA: This Burris throw lever is proudly manufactured in the US with a lifetime warranty. SIMPLE & QUICK SETUP: This MK throw lever is a one piece construction, has one bolt to tighten, and installs in one minute or less. 3D PRINTED: This throw lever is made from durable nylon polymer and features a metal thread insert for increased strength. PERFECT MATCH: This MK Machining throw lever fits with any mounting setup. Exactly fits to magnification ring dimensions.