Features: Double-piston driving principle, drives friction discs on both sides at the same time, the brake pads auto return to position, stable brake, strong braking force. One-piece oil tank design, no separate oil tank cover, nice sealing effect, no oil leakage. The outermost layer is painted with baking varnish, matte texture, corrosion resistant. Fully enclosed angle, waterproof and dustproof, fully sealed, safe and maintenance-free. Forged with high-strength aluminum alloy, it is strong and wear-resistant, brakes quickly, and resets in time. Ergonomically designed three-finger brake lever is easy to operate and has strong braking force.