Feature:1. Aluminum Alloy Material: Made of high quality aluminum alloy, durable and not easy get rust.2. Bicycle Expansion Bar Plug: Expandable design, easy to install, firm and durable for bicycle use.3. Strong Compatibility: Suitable for 18‑20mm bicycle handlebars of most brands and types on the market.4. Application: Suitable for folding bikes, mountain bikes with straight handlebars and road bikes with curved handlebars.5. Bicycle Accessories: Lightweight, sturdy and durable, it is the perfect accessory to perfect your bicycle handlebar.Specification:Item Type: Bicycle Expansion Bar BlockMaterial: Aluminum AlloyBefore Expansion:Top Diameter 23.5mm / 0.92in, Height 29mm / 1.14in, Intermediate Diameter 18mm / 0.7After Expansion:Height 25.5mm / 1in, Intermediate Diameter 20.5mm / 0.8inApplication: Folding bike mountain bike straight handlebar road bike curved handlebar, 18-20mm / 0.7- 0.78in bicycle handlebar. Package List:2 x Bicycle Expansion Bar Block