"Internal expansion screw" for fixing 1 stairs (keel) and wall surface.
2. Fixation of column and pedal: use φ8 double-headed screw, crescent washer and nut to fix.
3 small column and bracket fixation: self-tapping fixation.
4. The column is fixed on the pedal: it is fixed with φ 10 double-tooth screw, crescent pad and nut.
5 Handrails on handrails or elbows: (φ8 double-tooth lead screw or φ8 through lead screw, crescent pad and nut) are fixed with glue.
6 Handrails and square heads of large columns: φ 10 perforated sections are fixed with hardware (φ8 double-tooth screws, crescent pads and nuts).
7. Pedals and risers are fixed with wooden tenons.
7 Handrails on the wall: The holes in the wall are filled with wood and fixed with metal fittings (φ8 double-tooth screws, crescent pads and nuts).
8 decorative cover: the fixing method is fixed with glass glue, and the glue cannot be exposed.