Lincoln K and KP Numbers › Lincoln Electric KP1993-1 EXTENSION GUIDE, 3/4 INCH TO 1 INCH Lincoln Electric KP1993-1 EXTENSION GUIDE, 3/4 INCH TO 1 INCH Sale Price: $34.10 Original Price: $38.19 EXTENSION GUIDE, 3/4 INCH TO 1 INCH PURCHASE PRICE SHOWN IS FOR A QUANTITY OF 1.000 Add To Cart Added! EXTENSION GUIDE, 3/4 INCH TO 1 INCH PURCHASE PRICE SHOWN IS FOR A QUANTITY OF 1.000