Wilson Case Mouth Inside Neck Reamer. Use on thick case necks after multiple sizing and firings. Material build up in case necks can cause high chamber pressures and erratic shooting. Stock sizes are larger than bullet diameter and are to be used on AS-FIRED brass.Features: Reamers can be used when Forming Wildcats from a Parent case. Standard reamers are sized for use on fired un-sized cases Special sizes can be ground but will extend lead time please call for pricing and availability Price includes one Knob Style Handle and one Inside Neck Reamer. Made in the U.S.A.