These threaded screw studs will fit the sockets and plates we have for sale. 
These are genuine DOT brand fasteners. 
Made by the worlds leading canopy fastener manufacturerLift the dot threaded stud and nut

Overall length 28.7mm
Nickel plated brass head
5/8" or 15mm long thread / 8/32in (A2)unc nut
With nut

Marine gradeThese fasteners suit all sorts of boat canopy covers, gazebo curtains and other upholstery work.