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They are caster(wheel) axle bolts. There's a fitting in the center of the head for injecting grease.
Bounty: $6.00
Posted By: zmotz1
I'd Like to Know:
What is this item and what are they used for?
          Item History: N/A
        
        
        
          Size: Fits a 19mm socket. 
Around 4" Long
        
        
        
          Markings: None
        
        
      
    
        
    Opinions
1)
    They are caster(wheel) axle bolts. There's a fitting in the center of the head for injecting grease.
References:
https://www.casterhq.com/Stainless-3-8-X-2-1-4-ZERK-AXLE-AND-NUT-p/AZ38-225-S...
By: stamcon Submitted on: 07/03/2021 at 11:36PM
    Accepted