Vortex Optics Riflescope Bubble Level for 34mm Riflescope Tube is a part of the high quality and dependable Riflescope Accessories from Vortex. All of the features you need for a price you want. Riflescope Accessories from Vortex are well known for their quality and Vortex Optics Riflescope Bubble Level for 34mm Riflescope Tube upholds that standard.