Precision machined from 6061 T6 Aluminum; Hard coat anodized for a lifetime of performance; Fully adjustable to fit both in spec and out of spec rail systems; Patented QD Auto Lock Lever system; Does not require proprietary tools for adjustment; Can be adjusted with your finger or a flat blade screwdriver; Lever can be configured to lock to the front or the rear; Superior clamping surface to insure maximum rail engagement; Made in the U.S.A.; Black Finish