Feature: GREAT PERFORMANCE: Expandable design, easy to install, firm and durable for bicycle use, well compatible for 18‑20mm bicycle handlebars of most brands and types on the market. TOP QUALITY: Made of high quality aluminum alloy, our Bike Expansion Lock Bar Plug is durable and not easy get rust. NICE REPLACEMENT: Lightweight, sturdy and durable, the Bicycle Expansion Bar Plug is the perfect accessory to perfect your bicycle handlebar. WIDELY USE: Suitable for folding bikes, mountain bikes with straight handlebars and road bikes with curved handlebars. Specification: Item Type: Bicycle Expansion Bar Block Material: Aluminum Alloy Before Expansion: Top Diameter 23.5mm / 0.92in, Height 29mm / 1.14in, Intermediate Diameter 18mm / 0.7 After Expansion: Height 25.5mm / 1in, Intermediate Diameter 20.5mm / 0.8in Application: 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