Fits most hair clipper brands.  Steel spring is heat treated for durability and lasts longer than plastic clips.  Available in six sizes, Speed-O-Guide's superior-quality plastic combs are both flexible and strong. Create the latest looks in flat tops, crew cuts, buzz cuts, tapering, layering, texturizing and more.  DIRECTIONS:  1. Hook steel spring to the back edge of the clipper blade.  2. Pull until blade drops into V shaped ledge at the top of comb.