| Specification - Material: Aluminum - For T-12 LED lamp tube Dia.meter from 38 to 42mm - Rubber pads equipped inside that protects your LED tube from scratches. - The distance from clamp to clamp (center to center) is 47mm. - A Dia. 66mm rubber magnetic comes with 1/4“-20 male threaded - One 3/8“-16 female threaded hole in each end of the clam - Weight: 370 g (0.82lbs)