Feature: 1. Such kind of carbon steel chain with links is suitable for all proportions for ZhouYu sprockets. 2. The chain has high accuracy with strong rigidity, which makes link wheels firmer. 3. Uses the broken chain pliers tool sold separately, you can easily cut the carbon steel chain to a custom length. 4. Made of carbon steel materials in high quality, such roller chain can be easy to use in the practical life. 5. Fit for TETRIX / FTC / FRC / FIRST / WRO and other world robot competitions, this roller chain keeps high durability. Specification: Item Type: Roller chain Material: Carbon steel Pitch P: Approx. 6.35mm / 0.3in Roller Diameter d1: Approx. 3.3mm / 0.13in Inner Section Width b1: Approx. 3.18mm / 0.1in Pin Diameter d2: Approx. 2.31mm / 0.09in Pin Shaft Length: L: Approx. 7.9mm / 0.3in Lc: Approx. 8.4mm / 0.33in Inner Chain Plate Height h2: Approx. 6mm / 0.2in Chain Plate Thickness T/t: Approx. 0.8mm / 0.03in Circumference: (Approx. 0.5meter / 1.6ft)/PC Number of Sections: 79 sections. Package List: 1 x 0.5-Meter Roller Chain4 x Main Connecting Link