Extensive round brush set for a wide range of use whether in the workshop sanitary jobs car repairs etc with this set you can easily clean or strip holes threads sleeves etc from most materials like steel stainless steel metal plastics etc this set consists of 36 round brushes 12 each from stainless steel plastic and brass with hexagonal collet sizes from 8 to 19mm ascending by 1mm also included in the delivery are a screwdriver handle with quick change hexagonal coll