MIG Drive Roller 

30.0mm dia x 10.0mm wide x 10.0mm Bore 
0.9-1.2mm
U Groove (AL)
Part No. RU301010.09.12
Drive roll kit ALUMINIUM wires
Suits Bossweld TREO 175 & possibly many more (MIGOMAG?).
"U" groove drive wheels reduce slipping when using soft Mig wires.
Requires less tension on idle wheel.
Wheel Size diameter 30.0mm x 10.0mm wide x 10.0mm Bore + (keyway 3.0mm )
PHOTO for display ONLY read dimensions & wire sizes given