SCREW FIT – Adjust the blade to full forward position and put the small top blade over the clipper drive finger. 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 is aligned with the first small tooth of bottom blade. After blade is aligned, tighten screws, turn switch on and off a couple of times and double check alignment of blades. PRECISION GROUND - We only use high precision blade grinding technology, ensuring the best cutting performance for you. Our blades offer superior performance, equipped with fin teeth offering fine quality. STURDY MATERIAL - The replacement clipper blade is made of stainless steel, corrosion-resistant and wear-resistant quality material. They are durable for long use and provide a precise cut. CUTTING LENGTHS – Achieve cutting lengths between 1mm and 3mm. SUITABILITY – A replacement standard blade set for the Wahl Rex 1230 Animal Clipper.