The Kadee #262 Narrow Snap - Together Draft Gear Box, designed for HO Scale, comes in a pack of 10 pairs (Part #380 - 262). It's precision - engineered to work seamlessly with all Kadee® 'WHISKER' Couplers. For the center hole, 2 - 56 screws are commonly used, and the screw length can vary according to the mounting situation.

To use this Kadee #262 Draft Gear Box, first make sure it's the right fit for your HO - scale model. Since it's precision - engineered for Kadee® 'WHISKER' Couplers, simply snap it together with the couplers. When it comes to the center hole, use 2 - 56 screws, but keep in mind that the length of the screws may change depending on how you're mounting it. As for maintenance, keep it clean from dust and debris. If you notice any loose parts, gently snap them back into place. Don't use harsh chemicals on it as they might damage the material.