Pro-Shot .50 Caliber Pistol Brush Dozen Pack 12 Quantity. Here's why specifically designed bore brush for each Cal./mm brush is sized to make cleaning faster & easier and aid in extended brush life. Brass Core and Bronze Bristles (Benchrest Type)designed for competition shooters to withstand frequent use.Construction consists of a high quality brass core and coupling with bronze bristles. Pro-Shots Benchrest Quality Brush has been used for many years with several world records to its credit. This bore brush is exceptional for bore cleaning with superior cleaning ability and it will not harm the bore. Specifications for Pro-Shot .50 Caliber Pistol Brush Dozen Pack: Manufacturer: Pro-Shot Quantity: 12 Gun Type: Pistol Features of Pro-Shot .50 Caliber Pistol Brush Dozen Pack American Standard #8-32 thread. Package Contents: Pro-Shot .50 Caliber Pistol Brush Dozen Pack Pro-Shot 50P-D: .50 Caliber Pistol Brush Dozen Pack 12 Quantity