Single Speed BMX Road Bike Adjustment Screw, Chain Tensioner, Black Description: Application: The single-speed chain tensioner is suitable for folding and single-speed bicycles. Applications: The bicycle chain adjuster is used to tighten the chain, prevent the chain from jumping and ensure smoothness High-quality material: The mounting screw set is made of aluminum alloy, which is durable, practical, reliable, lightweight, and compact. Easy to use: Bicycle regulator accessories adjust the length of the screw to achieve the perfect chain tension. Replacement accessories: The bicycle clasp is the perfect replacement accessory for your folding bike. Specifications: Material: Aluminum Alloy Size Chart: 2,6 cm x 1,8 cm x 1,5 cm/1,02 inch x 0,71 inch x 0,59 inch The package includes: 1 bicycle chain tensioner