Unique GR2 Bearing Design, reduces wear, extending life. Base mounting holes enable easy fixturing. Designed for use in all positions. High strength alloy steel for durability. Redesigned cylinder thread protector for ease of use. Heavy-duty, pretensioned spring improves retraction speed. Baked enamel finish for increased corrosion resistance. CR-400 coupler and dust cap included on all models. Plunger wiper reduces contamination, extending.