Good quality natural hog bristle oval sash brushes. These inexpensive brushes have been developed to meet special industrial needs involving coatings, solvents and lubricants. They are also used extensively as machine brushes for brushing away chips and cleaning machine parts. These brushes are handcrafted in the U.S.A, with the finest 100% natural grey china hog bristle, which has a machined chisel trim and is held together with a 2 part epoxy cement in a tin lock seam ferrule. One advantage to using this brush, is its polypropylene round sash handle, which is resistant to solvents and most chemicals. Also popular as an oil and chip brush. The oval diameter of this brush is referenced in the below product listing with the first diameter being the short end and the second diameter being the long end.