FEATURES -For calibers: .40, .401, .404, .405, .41, 10MM, 10.75MM -8-32mm thread size -2" brush length -Superior construction -Precision thread with no weak undercut -Tufcor® proprietary core wire that is corrosive resistant, has a tighter twist for better bristle retention, and can be used with all firearm cleaning chemicals -Size stamped on size and color coded wires