The product is a Zhongsai bicycle bottom bracket, which is a component that connects the crankset to the bicycle frame and allows it to rotate freely. 
Brand: Zhongsai
Model: BC 1.37 x 24T, L-122.5mm→R
Type: Square taper bottom bracket with a sealed cartridge bearing unit
Function: Provides smooth rotation and protects the bearings from dirt and moisture
Compatibility: Designed for bicycles with a 68mm shell width