The frame width on these frames is 4 1/4 Inches . The frame width on windsor frames generally ranged between 4 1/4 - 4 7/8 inches across the front. A frame width of 4 1/4 - 4 3/8 is generally on the small side. A frame width of 4 1/2 - 4 5/8 inches was the average size and will work for most people. A frame width of 4 3/4 inches and wider is on the large side.

The lens diameter on these frames is 40mm. The lens diameter on windsor frames was generally between 36mm and 42mm. 36mm and 38mm are on the small side while 40mm was by far the most common size and will fit most people with a medium sized face.

The Bridge size on these frames is 17mm. The bridge size on windsor frames was generally between 19mm and 27mm. A bridge size of 20mm-25mm will work for most people.

The temple length on these frames is 6 1/4 inches. The temple length on windor frames was generally between 5 ½ - 7 inches. A temple length of 6 or 6 ½ will work for most people, while 5 ½ is quite small and 7 is quite large.