Spectra Precision Replacement Bubble Vial Kit The Spectra Precision Replacement Bubble Vial Kit is a convenient replacement leveling accessory designed for maintaining accurate rod clamp alignment in construction and laser leveling applications. The kit is optional for the C45 and C59 rod clamps and comes included standard with the C70 rod clamp . Key Features • Replacement level vial kit for Spectra rod clamps • Optional accessory for C45 and C59 clamps • Included standard with the C70 rod clamp • Supports accurate receiver leveling and alignment