The NORAM 1800 Series has been engineered to respond to a wide range of power demanding industrial applications. The three-shoe design gives 360° of contact surface for maximum torque efficiency with less slip and greater operating range. Shoe linings have a high coefficient of friction and are resistant to wear, fading and troublesome vibration. Specifications Rated for 12 to 18 horspower engine 1" bore 1/4" beyway Bearing; Ball Double Pulley with 4" OD for A or B Belt Engagement Speed = 1800 rpm