fir wood stretcher bars Material: pine & beech wood The moisture: under7-12% Fir wood stretcher bars We have our stretcher bar factory. We can supply fir wood and pine wood stretcher bars ... .Our standard sizes include: 18x25mm, 18x40mm, 38×38mm, 38×64mm, 25×35mm ,20x25mm, 30x36mm, Our stretcher bars ...