Telespar's 12 Gauge Telescopic Solid Square Tubing is perfect for industrial and OEM applications. Solid (non-perforated) material. 12 gauge (.105 wall thickness). Available in multiple sizes and in either pre-galvanized or plain carbon steel finishes. Material is sold in full 24' lengths but can be cut to 6' or 8' lengths. Please note, by adding (1) piece to your cart, you are ordering (1) individual length of Telespar. To achieve telescoping effect, you'll also need to add (1) length of Telespar that is the OD size either above or below. Example: if you order 2", you'll need to order another length of either 1-3/4" or 2-1/4".