.50 Caliber Rifle BrushBenchrest bore brushSpecifically designed for comp. shooters to hold up to frequent useManufactured with a high quality brass core and couplilng with bronze bristlesCredited to several world recordsGreat for bore cleaning that will not damage the boreAmerican standard #8-32 thread*NOT made for black powder rifles, use item# 50BP10/32 MFR# 50RUPC: 0709779100163