Thru Threaded Aluminum Boss Material = 6061 T6 Aluminum See image for body dimensions. The overall body size is similar for all thread sizes Multiple thread sizes available, see dropdown. If you need a thread pitch not listed it is possible to machine them for you. Minimum QTY run of 50 pcs will be required send us an email with your requrements. -MUST BE WELDED IN All Bosses are quality checked with calibrated thread gauges while machining and again before entering inventory. We do not replace weld bungs after they have been welded or appear to have been used.