DRIVE MEDICAL STDS1040S UNIVERSAL CUP HOLDER 3"" WIDE 1/PK NEW CLAMP ALLOWS CUP HOLDER TO SWIVEL TO KEEP CONTENTS LEVEL. EASILY ATTACHES TO WHEELCHAIRS ROLLATORS OR WALKERS WITH TUBING DIAMETER FROM 5/8"" TO 1"". SPECIAL CLAMP INSERT CAN BE ADDED OR REMOVED AS NECESSARY TO ACCOMMODATE DIFFERENT SIZE TUBING. MADE WITH DURABLE LIGHTWEIGHT PLASTIC.