IRWIN Level, Extendable, 6-17 ft, 4 Inch (1801108)

Locking rails that are extendable Strong aluminum 3-rail I-beam construction. A three-rail design is ideal for plate leveling. For life, it is guaranteed to be accurate to.058°. Made in the U.S.A Voltage: 1.80 volts Product Dimensions (cm): 3.50 x 20.32 x 182.88   Three heavy-duty aluminum I-beam rails support the IRWIN Extendable Level. The three-rail design is ideal for plate leveling and is guaranteed to be accurate at 0.58° for life. Made in the U.S.A.