Plastic Drink Holder Is Slotted On Two Sides To Hold A Cup With Handles And Is Accessible To Left Or Right-handed People It Can Also Hold A Glass Can Or Bottle The Rugged Plastic Clamp Has A Large Easy-to-tighten Lever Knob The Clamp Fits A 1 Diameter Tube And Comes With A Sleeve To Reduce It To Fit 7/8 Tube Frames