The reamers are used sequentially beginning with a 2.5mm diameter and ending with the diameter of the intended implant. Reamers have horizontal markings at 6.0, 8.0, 11 and 14mm, whereas older reamers may have different markings. It is imperative that the depth indicators on the latch reamers are known prior to surgery. No assumptions should be made about the height of the first marking on any latch reamer. If there is any doubt about the markings on any drill or reamer, take a measurement prior to using the reamer.