Bullet measuring ruler or gauge plate or gauge is a device for measuring the size of the bullet. It is a two-piece steel alloy made with the most precise CNC machines and can be adjusted for 4.5 and 5.5 bullets. By moving the bullet along the ruler, these tools separate the bullets in the sizes of 4.47 to 4.54 and 5.49 to 5.57 for the shooter. To obtain the head size of each of the 4.5 and 5.5 bullets There is a need for the exact index and size of the bullet that adjusted and measured the gauge based on the desired bullet. These indicators are presented in 2 numbers for the size of the bullet. On the ruler, numbers from one to nine are written with half-centimeter intervals, and when sorting, they are either in a bunch or in bunches between holes that fit Numbers inserted on the ruler.