Acid Glue Brushes Made With Horse Hair Bristles,Tin, Metal Tubular Ferrule Handle, Acid Flux Brushes for Home, School, Shop, Garage (144) Perfect for applying wood glue to small areas like shelf joints and dado slots. Also great for Acid/Flux application and removal, apply Flux for rosin-core solder. Specs: 5- Tubular Metal Handle - 7/8 long by 3/8 wide Horsehair Tight Bristles - with 3/8 Ferrule - Overall Brush Length 6. Wipe away Tarnish and apply Tarnish-Removal Chemicals/Creams. For dabbing into squeaky hinges. Apply Grease to old vehicle guts. Brush seam sealers in auto body applications. Spread dielectric grease, caustic materials. Easy reach corners and get into/between all the pins & tight nooks and crannies. Smear oil on everything everywhere, clean oil and chips after machining or drilling some parts. Apply Naval Jelly and works well for applying Froglube to guns. Handy for removing dust from places you can't reach, Brushing dust off computer fans/heatsinks.