These stainless steel column nuts are replacements for damaged or misplaced original Agilent nuts. Use with short ferrules. Hexagonal shape allows tightening with a wrench to keep fingers from getting burned.. Fits Agilent injectors and non-MS detectors. Hexagonal Wrenchtight Version. Pack of 2. . . Sigma-Aldrich 24833-U Capillary Column Nut, Hexagonal Wrenchtight Version, Pack of 2. Country of Origin : United States. Part Number : 1195W77EA. Pack of : 2.