A birch board is required on an ongoing basis.
21x96x1005 mm, 1 grade, freshly sawn.
Dimensions and geometry are sustained.
Mold, rot, pickle, bark, wormhole are not allowed.
Healthy, intergrown and captive knots are allowed (with a diameter of up to 3-4 cm, but not more than 3-4 pcs.
Per 1 meter of the product).
A healthy false core is allowed.
Position tolerances: thickness: -0 to + 1mm width: -0 to +2 mm length: + 0 / -2mm.

- Translated with google