These hair trimmer alternative blades are made of steel material, which function corrosion-resistant and wear-resistant, well suited for long-life use and may reside pointed, sturdy and dependable to be applied for decades Each piece of hair clipper alternative blade is designed with 2 holes, which makes it considerate and useful to operate, brings you cleaner and more regular hair slicing experience, also be utilized easily to gild via manner of utmost hair types conveniently Our adjustable hair clippers blades fit with 8148, , 8591, 8504, 2241 and 2240, you'd simply update the blades per your needs, and no use to return to a call a brand new clipper, with correct installation, it would paintings as effectively as a new one Make the adjustable lever of the blade visit the total ahead position, position the small height blade over the clipper drive finger, then function the bottom blade on height of small peak blade, use screws and partially tighten, hold that the bright left hand enamel of peak blade is aligned to the 1st small teeth of bottom blade, then you can tighten screws, you would change a number of to make whether you have aligned blades; Note: the screws usually are not included colour: black Material: metal Package Contents: 1*big knife 1*small knife Only the above package content, varied products are not included. Note: Light and varied reveals may cause the colour of the item within the picture considerably diverse from the genuine thing. The dimension allowed error is +/- 1-3cm.