Driak 63x51x18mm/2.48"x2"x0.7" 360 Degree Bullseye Level round Bubble Spirit Level With Mounting Hole, Use with Tripod 360 Degrees Round Bullseye Level Domed Level With Mounting Hole for RV Color:white / black case Material :PMMA.Accuracy : 15 /2mm The frame has screw holes for surface-mounted applications. They are typically used on equipment, vehicles, cranes and lifts,Excavators and dumpers