Attention model train enthusiasts! These Kadee HO scale draft gear boxes are essential for installing and maintaining your model train couplers. This pack includes 10 plastic draft gearboxes that work with Kadee #5, 58, and 20-Series couplers (both medium and long shank versions). They're also compatible with medium and long shank Whisker Couplers, making them super versatile for various Kadee coupler setups. The installation is straightforward - these boxes provide the housing and mounting point for your couplers, ensuring proper alignment and operation. The plastic construction is durable but easy to work with if you need to make adjustments. Whether you're building new rolling stock or repairing existing cars, having these draft gear boxes on hand makes the job so much easier. They help ensure your couplers sit at the correct height and angle for reliable coupling and uncoupling operations. For serious model railroaders, keeping a supply of these on hand is just good practice - you never know when you'll need to replace a damaged box or equip a new car. The quality is exactly what you'd expect from Kadee - precise dimensions and reliable performance that makes your model railroad operations run smoothly.