2pcs 8mm Mini Bike Chain Tensioner with 1-3/4" Roller fit for 2PCS, black Product Details Manufacturer: GOIRTUTSS Brand: GOIRTUTSS Model: Chain Tensioner Item Weight: 13 ounces Package Dimensions: 3.94 x 2.68 x 2.28 inches Item model number: AMJX-BD11440 Exterior: Machined Manufacturer Part Number: AMJX-BD11440 This chain tensioner fitment for Coleman Powersports CT100U/CC100X , for Baja Doodlebug DB30?Blitz?Dirt Bug?Racer) , for Hensim Doodlebug DB30?Blitz?Dirt Bug?Racer) , for Motovox MBX10/MBX11 And Predator 79cc 97cc 98cc 100cc 2.5 3.0hp engines Features and advantages : By adjusting the tightness of the chain, it ensures smooth operation and prevents the chain from falling off during cycling. Using high-strength metal material, the surface is smooth, reducing chain wear and extending service life. Material and Structure : The chain tensioner is made of durable metal and rubber materials, sturdy and wear-resistant, with a smooth surface, effectively reducing chain wear, and suitable for high-strength use. Installation instructions: Use screws to secure the tensioner to the frame of the mini motorcycle, being careful not to overtighten the nut, otherwise it will cause the roller to not rotate freely. For CT100U/CC100X models, it may be necessary to drill holes to install chain adjusters. Packaging Content: Includes 2 chain tensioner roller, 2 nut, 2 screw rod, 2 screw washers, 2 C-clip