Strainer bar

A strainer bar is used to construct a wooden stretcher frame used by artists to mount their canvases.

They are traditionally a wooden framework support on which an artist fastens a piece of canvas.

They are also used for small-scale embroidery to provide steady tension, affixing the edges of the fabric with push-pins or a staple gun before beginning to sew, and then removing it from the frame when the work is complete.

Strainer bars are fixed to one another with wood glue, nails or staples, often in conjunction.

Strainer bar frames are often reinforced with other fixed elements such as corner and cross braces.