Description: 20Pcs screw chains( each with 50pcs screws). Delicate workmanship and long service life. Each screw chain has 50pcs screws, the screws can be re-install into the chain. Suitable for or electric drill. Essential accessories, suitable for replacement of old or damaged ones. Easy to install and use. Convenient and practical. Accurate delivery of nails, nails are not easy to fall off. Ideal for a range of materials and applications such as carpeting, ceiling, hardboard, cardboard, wardrobe backing panels, PVC panels, roofing, woodwork and craft work. Specification: Length of Chain with Screws: approx.55cm/21.65inch Quantity of Screws: 1000pcs Quantity of Chain: 20pcs Size Chart: 55cm/21.65inch Package Includes: 20pcs chains with 1000pcs screws Note: 1. Please allow slightly error due to manual measurement. 2. Due to the difference between different monitors, the picture may not reflect the actual color of the item. 3. Wish you a wonderful on-line shopping!