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