Our SN4 national frames are used in British National and WBC shallow super boxes and come in packs of 10, assembled and pre-wired with foundation embedded. The dimensions of th10e frames are:

• Top bar- 17″ x 1″ (431mm x 22mm)
• Side bar- 5¹/₂” x 1 ³/₈” (140mm x 35mm)
• Bottom bar- 14″ (356mm)

All our SN4 frames are 1^st quality and contain no knots.