Used 1.750" alum. driveshaft collar clamp. Clamp is .800" wide, has two rare earth magnets epoxied into collar 180 degrees apart and clamps together using two 1/4-20 bolts.
Note: This is a used item. This item might have been taken in on a trade. RBS may have inspected this item and deemed re-usable. There is no warranty expressed or implied with this item.