Quality material: the adjustable clippers blade is made of stainless steel, corrosion-resistant and wear-resistant, the quality material can be applied for a long time, it is more pointed and stronger, thus it can work efficiently and provide better effects How to replace: adjust the blade to full forward position, and put the small top blade over the clipper drive finger, then place large bottom blade on top of small top blade, replace the screws and partially tighten; Make sure the extreme left hand tooth of top blade must be on the first small tooth of bottom blade; After blade is aligned, tighten screws, turn switch on and off a couple of times, and then check alignment of blades Wide compatibility: these 2 hole clipper replacement blades are compatible with 8148, 8504, 1919, 2241, 2240, 8591; Different from the size of screws, there are large screws and small screws, 8148, 8504, 2241, 2240 are small screws, 8591 and 1919 are large screws Functional and practical: these replacement blades are designed with 2 holes for easy using, 2 different sizes of hole diameter are provided for your clipper, including 3 mm and 1 mm, they can be attached easily and also convenient to maintain, in addition, this blade can provide an even and clean hair cutting option Package content: package contains 2 sets of clipper blades, convenient for your daily use and replacement; Color: silver