This pine eke fits on top of your National Brood Box, this does not just sit on top but two end pieces fit inside your National box to ensure the two parts, your brood box and the Eke act as one. No movement in high winds separately to the brood box, made to fit BS national brood box. To allow the use of 14 x 12 frames.
Select grade has no knots in the wood - Nails & Metal frame runners included.
2nd grade has some knots but not on any joins - Nails & Metal frame runners not included.
3rd grade has several knots but is still usable - Nails & Metal frame runners not included.