Description :  Bubble Spirit Level for 9-11mm Dovetail Rail Bracket Scope Mounts Sight 5.5x1cm   Features :  Horizontal direction at a glance. Fine workmanship、 practical、 high precision、 easy to use、 accurate. Before use、 make sure your scope is absolute. Good seismic performance. Suitable for 9-11mm dovetail rail bracket.   Specification :  Product name: Bubble Spirit Level Material: Metal Color: Black Size: Approx. 5.5x1cm\/2.16"x0.39" Weight: 16g   Package includeds :  1 x Bubble Spirit Level   Details pictures :