ITEM NAME:2x Motorcycle Chain Tensioner Roller W/ Spring For 50cc 125cc Quad Dirt Description: Top quality aftermarket Chain Roller Tensioner. Heavy duty chain idler guide wheel with upgraded torsion spring. Spring loaded tensioner automatically adjusting tension towards chain elongation. Chain idler fits many 50cc 110cc 125cc 140cc Dirt Trail Bike, Quad, Mini Moto, ATV. Smooth rotoring and longer life. Easy to install. Specification: Hole to Hole Distance: 5/8 inch (15mm) Dimensions: 15.0 x 10 x 7.0cm / 5.9 x 3.9 x 2.8 inch Screw Diameter: 0.5 inch (12mm) Inner Diameter: 3/8 inch (10mm) Material: Iron & Plastic Package Includes: 2 Pieces Chain Roller Tensioner Note: Please allow 1~3mm differs due to manual measurement. (1 inch = 25.4mm) Product color may vary slightly from what appears online due to monitor differences. SKU: DMO0019325719504731.Chain idler fits many 50cc 110cc 125cc 140cc Dirt Trail Bike, Quad, Mini Moto, ATV. 2 Pieces Chain Roller Tensioner. Spring loaded tensioner automatically adjusting tension towards chain elongation.