Durable and Reliable: These hair clipper replacement blades are made of stainless steel, corrosion and wear resistant, suitable for long time use and can keep sharp, sturdy and reliable to be applied for a long time. 2-hole design: Each piece of hair clipper replacement blade is designed with 2 holes, which makes it considerate and convenient for you, brings you a cleaner and more stable haircut experience, also can be applied gently to easily color most hair types. How to replace: just remove the two blade screws, remember to clean the dirt and hair of the clipper with a brush before replacement, and oil the underside of the lower blade, then place the small blade superior on the trimmer and put the large lower blade on top with the flat side facing the upper blade, finally tighten the screws to hold the blades in place. Functional and practical: these replacement blades are designed with 2 holes for easy use, 2 different sizes of hole diameter are provided for your trimmer, including 3mm and 1mm, they can be attached easily and also easy to maintain, in addition, this blade can provide an even and clean haircut option. Compatibility: our adjustable hair clipper blades are compatible with 8148,8504,1919,8591,2241,2240, you can just replace the blades according to your needs, and no need to choose a new clipper, with a facility correct.