Without an integrated housing, these motors are desinged to be directly integrated into custom mechanical systems, with the advantages of precise motion control, exceptional torque density and compact size . The Frameless BLDC Motor provide a versatile, high-performance solution for advanced robotics CNC machines and other precision automation systems. This series of motors are very popular. The sizes you can choose from are 56mm, 60mm, 76mm, 89mm and 95mm.