The wood spiral drill with countersink efficiently drills, countersinks, and deburrs in one step in wood. When mounted on a wood spiral drill, all three processes can be completed simultaneously. The countersink is suitable for both hard and soft wood, laminated and non-laminated particle board, as well as plywood. This multifunctional drill made of tool steel features a countersink angle of 90 degrees, five cutting edges, and can also be used as a depth stop. The countersink includes a hexagonal pin wrench, a wood spiral drill, and a conical countersink mounted on the attachment holder.