MIG Drive Rollers 

"U" Groove Drive Wheel
30.0mm x 10.0mm x 22.0mm Bore
(SP00014-1.0-1.2mm)
Part No SP00014 1.0-1.2mm
Drive roll kit 1.0mm & 1.2mm Mig wires
"U" groove drive wheels reduce slipping when using Aluminium wires.
Requires less tension on idle wheel.
30.0mm diameter x 10.0mm Wide x 22.0mm Bore.
Keyway 4.0mm wide x 2.0mm deep