Designed exclusively for Pride Quantum power chairs to be compatible with most Tru-Balance 3 Power Seating . This high-quality cup holder adds comfort and convenience to your daily routine. Whether you're at home, on the go, it ensures your favorite drink is always right where you need it. Fits T-Slot channel for easy installation. Clip attachment block into the T-slot channel on armrest, side rail, or accessory bar on your Quantum power chair. Engineered as a drop-in style cupholder. The cupholder "drops" into the preinstalled attachment block. Ensure cupholder is seated completely in attachment block before use.