These blades fit all Andis Model AG, AG2, AGC, AGR and MBG Clippers, Oster A-5 and similar models, and Double K Clippers.
Andis Blades are made of high quality carburized steel which extends edge life.
The cut indicates the uniform length of hair which will be left when you use the designated blade. Higher blade numbers indicate shorter hair length ie: A #4 blade leaves 3/8 inch of hair, and a #40 leaves only 1/100 of an inch. For lengths longer than 5/8", use a blade guard or comb.
Don't forget Lubricating Spray to cool and lubricate your blades.