Shipping Weight: 5 lbs This kit includes the replacement hooks for the GBC TL2900 electric twin loop wire closer. Over time the hooks on the TL2900 can become bent causing the wire spines to not close correctly. If you are having this problem then chances are you need to replace the hooks on your TL2900. You may choose to change the hooks on your own or to have one of our Technicians change them for you. Changing the hooks help to ensure your GBC TL2900 provides you with a consistent high quality finished product evey time.