BALDWIN FILTERS® Spin-On Oil/Hydraulic Filter helps to protect your vehicle's hydraulic system, with a Mircron Rating of 23. Technical Specs ---ItemOil/Hydraulic Filter ---Filter DesignSpin-On ---Thread Size - Automotive Filters1" ---Length5-3/8" ---Outside Dia.3-11/16" ---Micron Rating23 ---Includes20 PSID By-Pass Valve, I. Gasket ---Fluid Type - Automotive FiltersOil/Hydraulic ---Description/Special FeaturesFull-Flow Lube or Hydraulic Spin-on.