High-quality thin-wall telescopic aluminum tube for precision bicycle frame customization. Crafted from lightweight yet durable 6061-T6 aluminum alloy for optimal strength-to-weight ratio. Features seamless square tubing design with precision-machined inner walls for smooth telescoping action. Ideal for DIY bike builders, custom frame repairs, and performance upgrades. Anodized finish resists corrosion while maintaining sleek appearance. Perfect for creating adjustable seat posts, handlebar extensions, or innovative frame modifications. Our wholesale pricing allows bulk purchases for workshops or resale. Ships globally with industry-leading logistics support.