Breakthrough Clean Phosphorous Bronze Bristle Bore Brush is durable for effective cleaning without damaging your bore. The twisted brass core keeps brush rigid and has a deeper cleaning action than Nylon brushes. Standard #8-32 thread (standard shotgun #5/16-27 thread on .410/28g/20g/12g) One per package.
Specifications:

Type
Size
Quantity
Bristle Type	Phosphor Bronze
Length
Includes
Material	Brass
Tip Feature
Battery
Thread Pattern	#8-32
Protects
Suitable For
Eco-Friendly