Safco Products 2660BL RSVP  Set of 4 Locking Casters for RSVP  Table Base (sold separately), Black RSVP table base locking casters (Set of 4) For use with Safco Products RSVP Table Base Models 2655BL, 2655SL or 2656BL, 2656SL, sold separately Wheel dimensions 3 3/4"W x 3 1/2"D x 2"H