The retractor system operates manually with self-locking functions. The system applies to separate tissues or anatomical structures to increase exposure of internal tissues or organs in surgical field. Surgical operation Imported 304 stainless steel and PC material from Japan Stepped opening design(3mm-2mm-1mm) makes it easier to fix the hooks to the retractor ring 10 suturing window positions make the doctors more flexible and convenient Self-retaining stopping balls design enhance holding force