48" Jacket Zipper ~ YKK #10 Extra Heavy Duty ~ Aluminum Separating ~ Black (1 Zipper / Pack) 48" Jacket Zipper ~ YKK #10 Extra Heavy Duty Aluminum Separating ~ Black (1 Zipper / Pack) #10 YKK extra heavy duty Aluminum separating zipper. Made from the finest quality metal to ensure extra strength & reliability.