Designed to encapsutate standard push buttons.Comes with a a locking cap to ensureit cannot be removed without fully removing the padlock.Available in 2 sizes, small and large.Small: dia. x H: 75 x 40mm, with a 30mm hole to sit around the foot of the button.Large: dia. x H: 75 x 80mm, with a 30mm hole to sit around the foot of the button.