These multi-adjustable screw arms are used with the stretcher rods to form the Nurge adjustable Needlework frame. They are interchangeable so can be used with any size of Nurge stretcher bars.
They are available in 3 sizes: Small (adjustable from 19cm (7 1/2″) to 28cm (11″), Medium (adjustable from 27cm (10 1/2″) to 36cm (14″), and Large (adjustable from 33cm (13″) to 45cm (19″).
Whilst the width of the fabric is restricted to the size of the stretcher bar you can use any length of fabric.