FEATURES: • For accurate alignment of carbon or stainless steel pipe flanges • Flange Leveler • Two hole & level in one time-saving operation • Uses push button Quik Pin nuts for fast action • Features stub acme threads for maximum clamping & hardened steel for lasting use • Automatically centers in flange holes 5/8" to 1 5/8" (16 to 42 mm) • Easily replaceable vials in the event of breakage