Floor Springs K5000 series Floor SpringAs highest grade model for aluminum chassis and iron door… K6000 series Floor SpringAs highest grade model for aluminum chassis and iron door… K8000 series Floor SpringThe K8000 series are suitable for tempered glass and stai… K9000 series Floor SpringThe K9000 series are suitable for tempered glass and stai… K9000 series Floor SpringThe K8000 series are suitable for tempered glass and stai… ST75 series Floor Spring ST80 series Floor Spring