A3 Industries Xeno Cheek Riser For Offset Extension w/ Cover Plate. The riser mounts via traditional M-LOK mounting hardware and can attach anywhere along the length of the extension with up to 4in of adjustment depending on the length of the extension used. The Riser is machined from 6061 aluminum with profiled machining to keep overall weight below 4 ounces in it's tallest configuration. Cheek rests and risers are both manufactured from injection molded Zytel polymer. The XENO riser is also height adjustable and can be set to 5/8in 7/8in or 1-1/8in heights above the extension. Specifications for A3 Industries Xeno Cheek Riser: Manufacturer: A3 Industries Color: Black Fabric/Material: 6061 Aluminum Quantity: 1 Finish: Aluminum/Zytel Polymer Weight: 2.5 oz Length: 4 in Height: 1 in Features of A3 Industries Xeno Cheek Riser Up to 4in of horizontal adjustability. 5/8in 7/8in and 1-1/8in riser combos Light-weight 6061 aluminum mount with Injection molded Zytel polymer risers Package Contents: A3 Industries Xeno Cheek Riser A3 Industries XCRU-113: Xeno Cheek Riser For Offset Extension w/ Cover Plate