These hair trimmer replacement blades are made from steel material, which attribute -resistant and wear-resistant, appropriate for long-life use and can live pointed, sturdy and dependable to be applied for decades Each piece of hair clipper substitute blade is designed with 2 holes, which makes it thoughtful and convenient to operate, brings you cleaner and extra steady hair slicing experience, also be utilized easily to gild by means of most hair types with ease Our adjustable hair clippers blades have compatibility with 8148, , 8591, 8504, 2241 and 2240, you could simply replace the blades according to your needs, and no need to choose a brand new clipper, with right installation, it's going to paintings as efficiently as a brand new one Make the adjustable lever of the blade go to the complete forward position, function the small top blade over the clipper pressure finger, then role the large backside blade on top of small top blade, use screws and partially tighten, maintain yes that the acute left hand tooth of top blade is aligned to the first small tooth of backside blade, you then can tighten screws, you would possibly turn on and off a number of occasions to ensure whether you've got aligned blades; Note: the screws are not included colour: black Material: metallic Package Contents: 1*big knife 1*small knife Only the above package content, diversified products shouldn't included. Note: Light mirrored image and various exhibits may cause the colour of the object in the photograph barely different from the genuine thing. The size allowed error is +/- 1-3cm.