Precision craftsmanship: expertly manufactured to deliver a precise fit and reliable performance, enhancing bicycle stability. Suitable for lower mounting brackets and common bicycle replacement parts. Precision machining: carefully finished to ensure a precise fit and dependable operation, supporting components such as crank bearing conversion sleeves and bicycle mounts. High durability: built from long-lasting materials with excellent corrosion resistance and reduced wear over time; compatible with threaded inner bearings and inner bearing holders. Precision engineering: thoughtfully designed to provide a tight fit and reliable performance for bicycle inner bearings and BB assemblies. Use scenarios: - Replace worn or corroded inner bearings and bottom bracket components on road, mountain, or commuter bikes. - Convert a crankset with a crank bearing conversion sleeve to match new bottom bracket standards. - Upgrade threaded BB systems to improve durability and smoothness with compatible inner bearing housings.