The pictures and the manual for the DX Engineering Hexxagonal Beam will make it clear. The 1.250 inch OD fiberglass center post is sleeved with an 18inch long by 1.375 inch OD (1.250 inch inside diameter) aluminum tube from the hub down to the mast or rotator attachment. That dual section fiberglass inside of aluminum is about 14 inches long below the Hexx Hub. The 1.375 inch x 25.4 mm/inch = 34.93 mm. Will that slide into your 38 mm mast?
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