<https://thesydneycanvascompany.com.au/product/pq-green-cross-brace-professional-quality/#product>
<http://schema.org/description>
"Brace to go with the Professional Quality stretcher bar.\r\n\r\nA brace is required on any stretcher over 48 inches. Always brace with the shortest length. For instance, a stretcher of 20\" x 48\" will require a single 20\" brace.\r\n\r\nWhen both dimensions excede 48 inches a cross brace is required. When selecting cross braces please ensure that you select one Green brace and one Red brace otherwise the braces will not fit together.\r\n\r\nIf you are unsure of what bars and braces best suit your job please call us."
<https://thesydneycanvascompany.com.au/product/pq-green-cross-brace-professional-quality/>