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Aluminium Conservation Bars:
18 mm deep by 62 mm wide solid aluminium stretcher bars for professional and conservation use.
The heavy gauge aluminium has a much lower deflection than wood / aluminium composite bars, so the bars do not distort under tension.
The bars are fitted with a wooden strip at the back for securing the fabric and come supplied with all fittings.

Aluminium Conservation Centre Bar:
Because of the strength of aluminium stretcher bars, cross-bars are not necessary for lengths under 150 cm.
To have a cross-bar on the short dimension the frame needs a solid Centre Bar.
For the longer cross-bar dimension the frame will need a pair of Half Bars.
Centre Bars and Half Bars are secured using Cross-bar Clamps at each end.