These hair trimmer substitute blades are fabricated from steel material, which function corrosion-resistant and wear-resistant, compatible for long-life use and can live pointed, durable and dependable to be utilized for many years Each piece of hair clipper substitute blade is designed with 2 holes, which makes it thoughtful and handy to operate, brings you cleaner and extra regular hair reducing experience, even be applied smoothly to gild via means of most hair forms with ease Our adjustable hair clippers blades fit with 8148, , 8591, 8504, 2241 and 2240, you possibly can simply replace the blades in step along with your needs, and no need to return to a call a new clipper, with correct installation, it's going to paintings as efficiently as a new one Make the adjustable lever of the blade go to the complete forward position, function the small peak blade over the clipper pressure finger, then position the lowest blade on height of small peak blade, use screws and partly tighten, hold that the intense left hand teeth of height blade is aligned to the 1st small tooth of bottom blade, then you definately can tighten screws, you would possibly exchange a number of to make whether or now not you have aligned blades; Note: the screws are not integrated colour: black Material: metal Package Contents: 1*big knife 1*small knife Only the above equipment content, different products aren't included. Note: Light and assorted exhibits can cause the color of the item in the picture a chunk various from the genuine thing. The size allowed error is +/- 1-3cm.