Fit for: / Razor Electric MX350 Dirt Bike/ / Razor Electric MX400 Dirt Bike/ / Razor Electric SX350 Dirt Bike/ / Razor Electric ZR350 Dirt Bike/ Long term driving of dirt bike can cause chain tensioner wear, looseness, detachment, and even damage Therefore, it is necessary to regularly inspect and replace the chain tensioner to ensure driving safety. Feature: 1. Long of life, 2. High of Quality, 3. Easy to install. 4. You can use chain breaking tools to reduce or increase master links to meet your needs. Package Including : 1 x 25H Chain 126 Links, 10 x 25H Master Links, 1 x Chain Tensioner Kit, 1 x Chain Beaker Tool Kit. Please check the description to confirm the compatibility before purchase. KAMIER #25 Drive Chain 126 Links with Chain Tensioner Adjuster Kit Replacement for Razor MX350 MX400 SX350 ZR350 Dirt Rocket Bike Kids Electric Motocross Off Road Roller Chain Breaker Heavy Duty Parts