Redding Reloading .287in Heat-Treated Steel Neck Sizing Bushing. Because of variances in thickness for the neck brass the standard die sizes the neck under the preferred diameter. To get the proper tension on the bullet an expander ball is pulled. In addition this bushing is self-centering and changeable which makes it possible to set the amount of tension on a bullet with precision. As a result there is less work on the brass helping prolong life while increasing accuracy. Specifications for Redding Reloading Treated Steel Neck Sizing Bushing: Manufacturer: Redding Reloading Quantity: 1 Color: Silver Condition: New Fabric/Material: Brass Gun Type: Rifle Package Contents: Redding Reloading Treated Steel Neck Sizing Bushing Redding Reloading 73287: .287in Heat-Treated Steel Neck Sizing Bushing