These hair trimmer substitute blades are made from steel material, which characteristic corrosion-resistant and wear-resistant, appropriate for long-life use and might reside pointed, durable and loyal to be utilized for decades Each piece of hair clipper substitute blade is designed with 2 holes, which makes it thoughtful and handy to operate, brings you cleaner and more regular hair reducing experience, even be utilized smoothly to gild by means of manner of maximum hair types with ease Our adjustable hair clippers blades fit with 8148, , 8591, 8504, 2241 and 2240, you'll simply replace the blades per your needs, and little need to make your mind up a brand new clipper, with correct installation, it should work as efficiently as a fresh one Make the adjustable lever of the blade visit the total forward position, role the small peak blade over the clipper power finger, then function the bottom blade on peak of small height blade, use screws and in part tighten, maintain that the bright left hand teeth of peak blade is aligned to the first small tooth of bottom blade, then you definately can tighten screws, you'll substitute several to make whether you've got aligned blades; Note: the screws are usually not included colour: black Material: steel Package Contents: 1*big knife 1*small knife Only the above equipment content, varied merchandise usually are not included. Note: Light and assorted displays can cause the color of the item in the photograph barely assorted from the real thing. The size allowed error is +/- 1-3cm.