Miller Drive Roll Kit - VK Groove 4 Roll Genuine Miller VK-Groove 4 roll drive roll kit for your Millermatic 300/350/350P, 54 Series, 24A and R-115 Miller wire feeders using a standard four roll drive system. VK-Groove drive rolls are ideal for feeding flux cored and metal cored welding wires. Each kit comes complete with 4 drive rolls and inlet wire guide and roll guide.