This 10-piece kit has stainless steel brushes of various sizes to clean all piston and barrel lug parts with any cordless drill or screwdriver. This kit includes a specially designed speed wrench to remove the exhaust spring assembly in seconds. Along with banded end brush will clean the bottom of the barrel lug in a snap. Under power the bands will fall back allowing the brush to fan out and clean the walls and bottom quickly. The port brush will clean the barrel porting. The brass adapter will convert any standard brush to a power driven. With two utility brushes for the trigger assembly. A gunsmith bore and chamber brush. An easy application to clean any A-400s or 391s to keep you shooting longer! Kit comes complete in a carry case that will fit in most shooter’s bag. Just call or email to purchase a kit.