Arlington SL350 3-1/2" Steel Sealing LocknutArlington SL350 SL350 Product Description Steel sealing locknut with pvc molded seal. Trade Size 3 1 2". Specification: Manufacture Arlington Weight 0. 210 lbs each Height 4. 675" Width 4. 675" Color Silver Material(s) Steel Trade Size 3 1 2" About Arlington: Arlington Industries, Inc. was founded in 1949, and in its early years served the electrical industry as a regional supplier of zinc die cast fittings. The company was acquired by its present