The blade size (blade holder scale) should be adjusted based on the thickness and hardness of the film material.
Thicker or harder materials require a higher blade size, while thinner films can use a lower setting.
The default blade size is 5, which works for most standard screen protector materials.
Below are the recommended blade size settings for different film types:
Back Film： 4
HD Clear / Matte / Anti Blue-ray： 5
UV / Privacy Screen Protector sheets ： 6
Explosion-proof Material ： 7～8