1.Aluminum Alloy: Bike bottom bracket is made of aluminum alloy, reducing noise, high strength and easy pedaling. 2.High Stability: The bike threaded bottom bracket can strengthen the lateral stability, not easy to loosen and reject noise. 3.Exquisite Workmanship: Alloy bottom bracket adopts accurate machining, with good sealing performance of the bottom bracket and long service life. 4.Lightweight and Durable: Bike hollow bottom bracket is light weight, small size, easy to install and use. Great accessory for cycling enthusiasts. 5.Scope of Application: This bike threaded bottom bracket parts comes with a wrench and is suitable for most bikes and mountain bikes. Item Type: Bike Bottom Bracket Material: Aluminum Alloy 5 Pass Width: Approx. 68mm-73mm/2.7-2.9in, Compatible with 30mm/1.18in Axle Crankset Suitable for Frame 5 Pass: ITA Italian Thread 5 Pass 2 x Bike Bottom Brackets Accessories 1 x Wrench