The Mechanical Stretcher Bars are handmade using museum quality kiln dried Pine wood, laminated and finger jointed for the strongest and straightest lengths. They are L-Shape with a tongue and groove join giving increased strength in their construction. The L-Shape construction also increases the rebate depth between your stretched material support and stretcher frame, reducing any risk of catching the frame while painting and causing a trace of the stretcher bars.
The stretcher bars simply slot together via the mechanical Hearts for stretcher bars and mechanical Ovals for the adjoining cross bars. When slotted together, the mechanical stretcher bars are perfectly square and require no fine tuning or adjustments.  

Screws are inserted into the mechanical hearts and ovals after stretching your material and simply turned to increase the size of the stretcher for the perfect tension.  
Mechanical stretcher Bars are handmade and are only available to buy online from Artist Surfaces. 

Mechanical Stretcher bars can be made up to 240cm in length and are ideal for larger artworks or small chunky canvases.

34mm Mechanical Stretcher Bars (Pairs)