About This The Dog Clipper Blades Compatible for HOLDOG Pet Grooming Kit, for HOLDOG dog clippers B8 Professional Clipper Blade: The replacement blade is made of Ceramic Blade & Stainless Steel Blade,Provide excellent cutting performance, ceramic blade can be more temperature -resistant, keep pets quiet Easy-to-Change and Clean Detachable Blades, the convenience of this design makes blade replacement quick and simple, while also facilitating daily cleaning and maintenance, ensuring optimal performance with every use How to Replace Blades: 1.Take out the old blade; 2.Twist the adjustmenbutton to 2.0; 3.Center the iron needleon the shaft; 4.Aim the blade's plastic hookinto the clipper's groove,making sure the middle hole ofthe blade lines up with thecentral axis; 5.Push the blade in untilit clicks. done! you'vefnished installing Important Note: Regular blade replacement is more efficient and comfortable, and gives you the best experience. We recommend replacing the blades every 2-3 months to keep them sharp and efficient