The instrument handle utilizes a bayonet luer-locking mechanism for changing the multiple instrument heads included in the kit. The luer locking style is guaranteed to never wear out.The Otoscope lens is an Optical quality GLASS that is specially-coated to help resist scratches. The lens is hinged and swings out of the way if needed for foreign body removal or cleaning.The otoscope also contains an all metal insufflation outlet.The kit includes an expandable nasal speculum, a bent arm trans-illuminator with a tongue blade holder, tongue blade, and 2 attachable #3 and #4 laryngeal mirrors useful for examination of the oro-pharynx.The kit contains an Ophthalmoscope that contains a complete set of lens from -25 to +40 diopters.