Ideal for mounting inline filters on tubular frame rails, System 1 offers CNC machined 6061 billet aluminum clamps to attach 2” or 2-1/4” diameter filters. The 2” clamps are available to fit 1.000”, 1.125”, 1.250″,1.375”, 1.500” diameter tubing and the 2-1/4” diameter filter clamp comes only to fit 1-3/4” tubing.