The ERGO XPRESS Lever Picatinny Mount quickly installs with a single lever to increase rail height by .75a ^2. Quickly installed with the use of a single lever Includes a 1.5" Picatinny Rail section to increase rail height by 0.75" Constructed of 6061 T6 anodized aluminum Dual Use, compatible with rifles and shotguns Specifications Weight 0.3 lbs Dimensions 20 x 3 x 10.5 in