Lincoln K and KP Numbers › Lincoln Electric K4879-3-10-564 MAGNUM� PRO 500WC BARREL, 20 FT. Lincoln Electric K4879-3-10-564 MAGNUM� PRO 500WC BARREL, 20 FT. Sale Price: $2,360.50 Original Price: $2,643.76 MAGNUM� PRO 500WC BARREL, 20 FT. PURCHASE PRICE SHOWN IS FOR A QUANTITY OF 1.000 Add To Cart Added! MAGNUM� PRO 500WC BARREL, 20 FT. PURCHASE PRICE SHOWN IS FOR A QUANTITY OF 1.000