The Leki Standard Expanders are great to get that little extra from your Leki trekking poles. These expanders come in pairs, so that you will have one for the two poles. It's made from durable plastic for a long-lasting life and to take on the rugged use you may subject it to. Its split dowel construction opens from the inside of the shaft and locks it in place. This will make sure that the expanders do not fall off, while you are on your climb. You have to turn the shaft clockwise to lock and counter-clockwise to unlock. They come in three varieties, namely the T2032 or the Summit Antishock, the T2030 or the Trail Antishock and the T2021 which is the simple trail version. Get the Leki Standard Expanders and enjoy your climb with the added confidence that these expanders offer you. Sold as a pair.