spring return hydraulic cylinder, 1.Ergonomics designs; 2.Hold high quality; 3.Short lead time; 4.Pretty competitive price. spring return hydraulic cylinder,Specification:Adjiust height:380~460mm; 450~570mm; 470~630mm; 520~720mm; 700~920mm.Material;Metal Chrome plated;Application:Office chair,esd chair,cleanroom chair,esd&cleanroom stool etc. spring return hydraulic cylinder