Nickel chelating resin binds to six histidine residues (6x His), a common tag used in protein purification. The resin consists of iminodiacetate coupled to 6% cross-linked agarose beads. The iminodiacetate binds divalent nickel ion with a capacity of 20 to 40 μmoles Ni²⁺/ml resin. The protein binding capacity is >50 mg protein per ml resin. We have demonstrated binding of >100 mg of a 50 kDa 6X His tagged proteins to a ml of resin. The spin columns are supplied with a resin bed volume of 0,2, 1 and 3 ml with total column volumes of 1, 8 and 22 ml respectively. Columns can be used as a spin format of gravity flow columns.