This ball caster uses a 1″ diameter plastic ball and has an overall height of 1.1″ (29 mm). The two-part housing snaps together to securely enclose the ball and three ball bearings that minimize friction between the ball and the ABS housing. The base piece of the housing has holes for three #4 or M3 screws (not included).
Alternatives available with variations in these parameter(s):
ball diameter ball material
Compare all products in Pololu Ball Casters.