A specially designed tool that is perfect for precise trimming of deer hair heads and deer hair bugs. You insert the double edge razor blade into the "jaws" where it is held securely. Then, the rotation of the ring nut allows you to flex the blade to the desired angle to have a more uniform and precise cut. Provides for a very safe and stable trim every time. Available at https://uglybugflyshop.crazyrainbow.net/stonfo-razor-blade-holder-for-trimming.html 
