1A box of 45 degree V-shape flat bottom engraving bits for your PCB/CNC machinery. 2Made of high quality tungsten steel for a precise, easy cutting experience. 3Large capacity chip elimination, high efficiency and good quality. 4A wide range of materials can be engraved: hardwood, density board, double color board, acrylic, plastic board. 5High-precision tool grinding, a powerful tool for 2D sculpture, 3D sculpture.