Embroidery hoops have a adjustment screw that you can tighten when necessary to keep the fabric as tight as a drumNot only for embroidery, needlecraft,cross-, hand embroidery (ribbon lace, crewel), embroidery Christmas ornament and quilting you can also make the decorations on the wallsLoosen the outer screws, flatten the inner hoop, place the cloth on the hoop, and place the outer hoop on the inner hoop.Flat the cloth and tighten the screw.Continue to flat the cloth, to ensure that no pleats, and pay attention to the fabric so that the warp and the vertical and horizontal edge, and finally tighten the screws.Check the hoop is tight enough. The method of checking the tightness is to use a needle having a thread through the surface of the fabric. This is possible if there is an explosion sound when the cable is pulled.colour: Wood colorMaterial: Woodsize: 17cmPackage Contents:20 x Bamboo stretchOnly the above package content, other products are not included.Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.