底部直径40MM，螺杆尺寸：5/16”-18SX1“ ，螺杆表面处理：镀锌

底部直径1“， 螺杆尺寸：1/4”-20SX1“

fit for 5/8" tube O.D., stem threaded 1/4"-20S, tube 16/18GA ( 1.2-1.5...

fit for 1" tube O.D., stem thread 1/4"-20S, 5/16"-20S or 3/8"-20S, tub...

fit for 1-1/2" tube O.D., stem thread 1/4", 5/16" and 3/8", tube 16/18...