XTS 1/2in. Offset See-through Riser Mount Black. The XTS Offset See-through Riser Mount is made from rugged lightweight aluminum making it very sturdy. The XTS 0.5in Offset See-through Mounting Riser will mount using standard AR-15 castle nut or can be purchased from XTS custom stock. Both mounting styles are perfect for your single point and two point mounting systems. Great for mounting single point optics to chassis-equipped rifles. See-through design allows user to see through the end of the mount. Installs with two set screws. Specifications for XTS 1/2in. Offset See-through Riser Mount: Manufacturer: XTS Color: Black Gun Model: AR-15 Height: 0.5 in Features of XTS XTS-68L See Through Riser Mount: 1/2in Offset Riser Mount See-through Package Contents: XTS 1/2in. Offset See-through Riser Mount XTS XTS-68L: 1/2in. Offset See-through Riser Mount Black