Stay sharp with the Block’s one time color run Red with Red nonslip thumb grip. Quick and simple to use handheld knife sharpener that is made to hones blades back to original cutting edges. Block sharpeners have a patent flex design that enable the honing rods to adjust to your blade. So, when you draw your blades threw the honing rods you can only make your knives sharper. You will not lose what you already have on your blades; you can only make them sharper without devalue expensive knives. You will find, with our unique flex design you can sharpen many different cutting edges. Like all V – edges from 17 to 24 Degrees, Convent edges, Serrated edges, Scissor edges and odd shaped edges and blades like Snake shaped Daggers, Hawk bill, and throwing knives. We make our Knife sharpeners in Houghton Lake Michigan, we are a small family business, we offer lifetime guarantee for factory imporfactions. Need help learning how to use your new Block sharpener? see our you-tube videos or visit our website. I put my website link on all my handles, for your convenience. I have lots of video’s there to teach you different techniques I use for sharpening different cutting edges.