Windsor Picket tops are manufactured to fit the round edge 75×16 steel tube.The windsor design is also available to fit 65 x 16 aluminium tube and also to fit inside 5o x 10 steel and aluminium tube
The Soverign picket top fits inside 65 x 16 tube.It is slightly wider and higher than the Windsor design picket,however it is the same Windsor profile.
This casting fits inside 65 x 16 The casting protrudes above the top of the tube.
The Regency picket top fits inside 75 x 16 tube.It is an old heritage design.It fits neatly inside 75 x 16 tube and looks good when powdercoated
