Medium Back Cap is designed to use with A-150 series, A-200 series, W-350 series, W-400 and W-410 TIG torches.Medium Back Cap For A-150, A-200, W-350, W-400 And W-410 TorchSKU: 300MQuantity*OrderProduct Attributes Accessory Type Torch Model » Back cap » A-150 » A-200 » W-350 » W-400 » W-410