Dencon RSM Kelly Bushing for Square Drive Master Bushing.
This bushing is equivalent to a 4KRVS Kelly Bushing.

for sizes:
2-1/2'' - 5-1/4'' square kelly's
3'' - 4-1/4'' Hexogonal Kelly's  

This bushing is without rollers, depending on the size kelly you have we can offer a new set rollers with this item. read less