Top flange has 11 holes, 6 drilled clearance for 5/16 bolts and 5 taped 5/16″ N.C. Bottom flange has 9 holes, 6 drilled clearance for 5/16″ bolts and 3 tapped 5/16″ N.C. Total of fourteen 3/8″ N.C. threaded nuts on channel, 5 on each side and 4 on flat side of channel. NOTE: Frames are interchangeable.
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