Stainless steel, available in brushed and mirror finishes, round tube connector with base design, base with mounting holes for fixing to wall or post side, tube end with hole and screw holes for inserting and locking handrail. Mainly used for side support and fixing of round tubes in stair handrails, accessibility handrails, corridor railings, etc., side mounting method is suitable for wall or post side installation scenarios, strong load-bearing capacity and stable structure, convenient installation and adjustment, a common support and fixing accessory for handrail systems.