This small ball caster uses a 3/8″ diameter metal ball. The height of the assembled kit ranges from 0.4″ to 0.6″, depending on the combination of included spacers used. This ball caster kit includes a black ABS housing, a 3/8″ diameter metal ball, two spacers (1/16″ and 1/8″ thick), and two 7/16″ #2 screws and nuts. The total height of the ball caster, 0.4″, can be increased to about 0.6″ using the included spacers. The two included #2 screws can be used to mount the ball caster to your chassis, or you can use your own #2 or M2 screws if your application requires a different length. Note that our ball casters are designed for small robots; they are not intended to bear more than a few pounds. With more weight than this, friction between the ball and the housing will generally keep it from rolling well. Resources * Dimension diagram * 3D Model (STEP) https://elecena.pl/product/22726348/pololu-ball-caster-with-3-8-metal-ball 2023-03-07 https://elecena.pl/product/22726348/pololu-ball-caster-with-3-8-metal-ball 2023-12-27 https://elecena.pl/product/22726348/pololu-ball-caster-with-3-8-metal-ball 2024-09-18 https://elecena.pl/product/22726348/pololu-ball-caster-with-3-8-metal-ball 2024-11-29 https://elecena.pl/product/22726348/pololu-ball-caster-with-3-8-metal-ball 2024-11-30 https://elecena.pl/product/22726348/pololu-ball-caster-with-3-8-metal-ball 2025-02-13 https://elecena.pl/product/22726348/pololu-ball-caster-with-3-8-metal-ball 2025-04-09 https://elecena.pl/product/22726348/pololu-ball-caster-with-3-8-metal-ball 2025-05-13 https://elecena.pl/product/22726348/pololu-ball-caster-with-3-8-metal-ball 2025-09-29 https://elecena.pl/product/22726348/pololu-ball-caster-with-3-8-metal-ball 2025-11-28 https://elecena.pl/product/22726348/pololu-ball-caster-with-3-8-metal-ball 2025-11-29