Replacement Dial & LevelReplacement dial set level for Centering Head No. 2UPX5 (sold separately).Adjustable bubble protractor that covers 180 degrees through two 90 degree quadrants, reading in 2.5 degree increments.Used with Jackson Safety Curv-O-Mark tools, including #4, #6, #7, #8, #20 and #33.Bubble cast in aluminum dial for added durability.