Specification:

Wheel: 1.5" - Polyolefin
Capacity: 33lbs./ per caster
Stem Size: 5/16" x 1 1/2" (8 x 38mm)
Not suitable for hardwood or laminate
Caster is designed for chairs or other wood furniture with wooden legs or a wooden base
Universal 5/16 x 1-1/2 mounting stem with metal mounting socket included
Not recommended for loads over 300 lbs
Safe for all Floors: Our ball castors don't damage your expensive hardwood floor,it could not leave a track on your floor.
Good finish,roll smoothly,easy installation and 360 degree rotary.
You just only use 4 screws to fix the caster wheels on your chair.

Package Included:

4 x casters four
4 x mounting sockets.