Made from high strength aluminum alloy for enhanced durability, can be used for a long terms Great for forming clean perpendicular joints in fence railings, greenhouse frames, shed supports, or furniture structures Suitable for both indoor and outdoor structural applications including garden sheds and fences : Slide the square tube into the joint and secure with screws Smooth interior fit ensures a firm hold and balanced across all three outlets in your pipe frame or furniture project Great connectors for constructing lightweight shelving units, pet enclosures, chair frames, partition supports, or reinforcing chain link fence structures, Manufacturer: OSNIYAW