Hudson Bearings drop in heavy duty ball transfer. Ball is made of carbon steel material and housing is made of stainless steel material. Integral flange at top allows unit to be dropped into 1-3/4-inches diameter hole. 1-3/16-inches main ball rotates on 1/8-inches support balls. Ball support cup is machined from solid steel and is hardened and plated. Available in stainless steel for additional corrosion resistance. Ball transfers solve a variety of material handling and motion control challenges, whether used in the traditional 'ball up' position or as a caster in the 'ball down' orientation. Ball transfers offer advantages to traditional casters, such as lower profiles and omnidirectional movement, often at a lower cost. Common applications: air cargo, shears, robotics, military logistics, store fixtures, die handling, laser and plasma cutters, glass and metal manufacturing, medical devices, caster substitution.