Tanis 05164 Nylon Miniature Twisted Wire Tube Cleaning Brush with Loop, 3/32" Diameter x 4" Length (Pack of 12) Single-spiral miniature brushes with stainless steel stem and loop for hand use For ultra-fine cross hole deburring, thread cleaning, blending, and polishing of small diameter holes Made of nylon Measures 3/32" diameter by 4" length 0.003 stainless steel filament diameter