The package includes 5 shapes: spherical, elliptical, cylindrical, large cone and small cone. 1/4" (6.3mm) shank is suitable for most electric and cordless drills. It is suitable for carving, carving, chamfering, carving, slotting , reaming and other effects of soft materials such as wood and plastic. Easy to use: This set of rotary cutters has a universal round shank, which fits n any drill bit. It is made of 45 steel with black flame tempered surface treatment to ensure its sharpness and durability. Convenient control, simple operation, safe and reliable, no dust pollution and improved working environment. Product size: The total length of the 5 drills is between 4 cm and 5.5 cm, and the width of the handle is 0.6 cm. Quantity delivered: 1 set, 5 drills in total.