Does what it was designed to. - Wheeler Fine Gunsmith Equipment Anti Cant Indicator, 30mm

The level looks good, clamps tight, and tells you when your gun is tilted. The level is a bit stiff to pull out, but that just means it won't flip out unintentionally. Even though a bubble level may not seem like a precise measure of tilt, it is positioned far enough out to be quite sensitive and the indicator at the bottom of the level helps to determine the exact middle.