These hair trimmer substitute blades are made of metal material, which attribute corrosion-resistant and wear-resistant, compatible for long-life use and might reside pointed, sturdy and reliable to be utilized for many years Each piece of hair clipper replacement blade is designed with 2 holes, which makes it thoughtful and helpful for you to operate, brings you cleaner and extra steady hair reducing experience, even be utilized smoothly to gild by way of most hair forms with ease Our adjustable hair clippers blades have compatibility with 8148, 1919, 8591, 8504, 2241 and 2240, you would simply replace the blades in line with your needs, and no need to come back to a decision a fresh clipper, with appropriate installation, it will work as efficiently as a new one Make the adjustable lever of the blade go to the complete ahead position, place the small top blade over the clipper force finger, then function the large bottom blade on height of small height blade, use screws and partly tighten, maintain yes that the acute left hand tooth of peak blade is aligned to the first small teeth of backside blade, then you can tighten screws, you may switch on and stale several occasions to make sure whether you have aligned blades; Note: the screws should not included colour: black Material: metal Package Contents: 1*big knife 1*small knife Only the above equipment content, other products are usually not included. Note: Light capturing and various reveals could cause the color of the article in the photo a little diverse from the genuine thing. The length allowed error is +/- 1-3cm.