There are 2 parts. Inner diameter is appr.50 mm. Height is about 80~85mm. Parts are designed for 3d printing. Resin material is the best. If you use ABS/PLA material, maybe you should sand the parts. Ignore the FBX and OBJ formats files, they are only used to meet the platform's requirement. STL files are included.More: https://www.cgtrader.com/monk3947