Package Included: 20pcs end brushes 1.End brush Size:diameter 0.314"(8mm),shaft approximately 1/8"(3mm),total length 4inch(100mm). 2.Designed for easy access into narrow holes and confined areas. 3.Commonly used for cleaning,deburring,grinding of Mold Hardware equipment and other fields 4.Great for circuit board cleaning, automotive rust remover, watch polishing, removing dirt and rust, car chip and scratch remover and more. Clean rings and other jewelry.