(Ball bearing with retainer.) designed for template shaping such as Arched or cathedral doors, etc. Features a steel ball bearing center and interchangeable, lightweight aluminum rub collar sleeves. To order, specify rub collar (example: #61600, 75mm), and then order the correct size Bearing to fit your spindle. The bearing includes a special steel retaining collar that properly secures the assembly to your spindle (3/4," 1," 1-1/4" Or 30mm), #61650, (D) bore: 1-1/4, 61650 insert accessory 1-1/4 bore ball bearing with retainer