ITEM NAME:Chain Roller Guide Tensioner Idler with Torsion 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 125cc 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: 1 Piece 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: DMO0022528167017380.Chain idler fits many 50cc 125cc Dirt Trail Bike, Quad, Mini Moto, ATV. Heavy duty chain idler guide wheel with upgraded torsion spring. 1 Piece Chain Roller Tensioner. Spring loaded tensioner automatically adjusting tension towards chain elongation.