These are stamped galvanized steel pipe swing hangers. They feature an "oil-lite" bronze bearing and axle bolts with lock tight nuts. Electric Scissor Car Jack is used by DC12V or car battery , it is easy for lifting cars for change tire easily Electric Scissor Jack,Electric Car Jack 3 Ton,Standtall Electric Car Jack,Automatic Scissor Jack JINYUN TIANYANG TOOLS CO.,LTD. , https://www.tianyang-tool.com
This is for commercial use. 
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Heavy Duty Hardware Swing Set Hanger for Steel Pipe
Model NO.: SC-116
for: Steel Swing Frames
Trademark: Swing hanger
Specification: High quality
Origin: China