"This is the CB1101A chain screen Prism 38T from Hesling. The chain screen is made of transparent plastic and has a length of 51 cm and a height of 18 cm. It is specially designed for a crank hole with a diameter of 110 mm. With 38 teeth provides This chain screen for optimum protection of your chain. Product Specifications: - Material: Plastic - Length: 51 cm - Height: 18 cm - Diameter Crankhole: 110 mm - Number of tooths: 38 - Weight: 220 grams - Color: Transparent