Floating pilot reamers use interchangeable pilots that are positioned at the front of the reamer. Most reamer manufacturers will, however, produce reamers to customer specifications. Combination reamers can be made out of cobalt, carbide, or high speed steel tooling. Taper pin reamers are designed to prepare the hole for taper pins. It is commonly used to make drill bits, taps, reamers, punches, dowel pins, and shafts. Shell reamers are designed for reaming bearing and other similar items. Morse taper reamers are available to alleviate minor damage. Metric taper reamers are designated by the small diameter. Other tools that are commonly used in a drill bushing include counterbores, countersinks, and reamers. Primer pocket reamers or swagers are used to remove military crimps in primer pockets. On burnishing drills there are 4 or more lands, similar to reamers. Tampers and reamers may also be made as separate tools. Major drawbacks are the scarcity of both reloading dies and chamber reamers in this format. Endodontic files and reamers are surgical instruments used by dentists when performing root canal treatment. Finally, reamers must be sharpened from time to time.