Machined from durable aircraft grade aluminium alloy, the Valve Extender 28MM by Topeak is designed to extend the length of two-piece type Presta valves by 28mm, making inflation easier. This handy tool is made from durable aluminium alloy and can be used to tighten or remove two-piece type Presta valve cores and valve extenders. The package includes two pieces of aluminium alloy valve extenders and one piece of aluminium alloy valve tool. The extender measures 3.8 x 0.6 x 0.6 cm (1.5" x 0.23" x 0.23") and weighs 1.4 g (0.05 oz). A must-have for any cyclist looking to improve their inflation process.