1. Product Overview SP45B heavy-duty ball transfer unit features a 45 mm bearing steel ball and robust 40Cr steel housing, delivering smooth 360-degree movement and high load capacity. Ideal for industrial conveyors, cargo handling systems, and heavy-duty material transfer equipment. 👉 Get a quote within 24 hours for your project 2. Key Advantages 45 mm hardened bearing steel main ball. Heavy-duty 40Cr steel housing. Smooth 360-degree multidirectional movement. High load