[Usage]: Suitable for fastening insulation bubble wraps, film and shading nets, screens to aluminium greenhouse grooved tracks. [Insulation Shading]: Fit for fixing in the winter and sunshade in the summer. [Plant Vine Support]: Used to attaching strings for vines climbing. The hole is 4mm/0.16inch in diameter. [Clip Extender]: Extension length is 3.2cm/1.3inch, particularly effective for insulation and works perfectly with shading too. [Easy to Use]: Simply insert into the roof channel of greenhouse and twist. colour: green Material: Plastic Package Contents: 50 x clip 50 x T clip 50 x gasket Only 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.