Product Description KASTLE EXPS Mount 2.26" BLK M1913 Picatinny Riser Lower 1/3 Co-Witness Optics 2.26” Optical Centerline Titanium KastleClamp™ Mounting Tech 7075-T651 Aluminum Type III MIL SPEC Hardcoat Anodized 100% Made in The U.S.A.