NPBT-1 1/2 CS Pipe-Mounted Ball Transfer Unit - 1-1/2" Main BallNPBT 1 1 2 CS Pipe Mounted Ball Transfer 1 1 2" Nylon Ball Made in the USA The NPBT 1 1 2 CS is a pipe mounted ball transfer unit featuring a 1 1 2" nylon main ball supported by ninety 3 16" steel balls. It's designed for smooth load movement and is ideal for mounting on a 2" pipe pedestal in front of shears, press brakes, or material tables where non marking surfaces are preferred. Main ball diameter: 1 1 2" Ball material: Nylon (non marking) Housing