This 16mm PD, 8mm REX™ pulley can achieve positive drive on 8mm REX™ profile shafting to drive a round belt. The two M5 set-screws provide a secure connection to the shaft.
Round belts are excellent for low-torque applications. Since the belt stretches, close is good enough when it comes to calculating what belt length you need between two pulleys. This method of power transmission is also extremely quiet!