Description: * brand new and high quality *Made of high quality material, and practical to use *Complete with both frame cups & set of 5/16" caged bearings 1 fixed cone, 1 adjustable cone, washers & lock nut *Standard size for Mountain bikes that use a solid 1 piece crank *Will also fit 3 piece cranks that use this large shell bottom bracket Specification: *Material: Steel *Color: Silver (As Pictures Show) *Weight: About 100g *Frame cup shell size 51.5mm *Approx outside diameter of bearing cages 44mm Package Includes: 1set Bottom Bracket BB Cup & Bearing Note: 1. The real color of the item may be slightly different from the pictures shown on website caused by many factors such as brightness of your monitor and light brightness. 2. Please allow slight manual measurement deviation for the data. Made from high-quality materials, our outdoor sports products are durable and affordable to meet your daily needs. Please check the product size and model before placing an order to ensure it is the product you need. When you encounter a problem, please contact us and we will help until the problem is perfectly solved. When you receive your product, whether you are satisfied or not, we want to hear your opinion. Every customer can enjoy free refund or exchange service for damaged/quality problem products.