<https://stairpartsdirect.co.uk/range/end-cap/#product>
<http://schema.org/description>
"Handrail fittings are supplied ungrooved and can be used with our 41mm, 45mm, 50mm and 55mm spindles.\r\n\r\nFor use with our 80 x 51mm handrail"
<https://stairpartsdirect.co.uk/range/end-cap/>