Column Protection System Guard Column Holder for EC 4 x 2 mm and 4 x 3 mm guard columns consisting of: – 1 guard column holder with steel capillary 0.12 mm ID special PEEK ferrule and connector to main column – 2 double open ended wrenches 12 and 14 mm – 3 ferrules – 2 replacement capillaries (0.12 mm ID)