Click to expand Tap to zoom Haltec TL-632 Standard Bore Truck Extension Service Tool by Haltec Corporation 2 reviews $28.99 | / SKU HTTL632 1 2 3 4 5 6 7 8 9 10+ Quantity Quantity Add to cart The Haltec TL-632 truck extension service tool tightens both metric (European) and domestic type extensions. The design is broached to engage the metric hex at the extension top and will reach the hex on a 7 in. U.S.A.-type extension.