You can purchase single blades between 14 and 26 inches in length! (geekwrapped.com)
The small, single blade cuts at about the length of a # 30 blade. (petbusiness.com)
They are premium quality, 2 - piece double edge single blade razors and fully adjustable, allowing the shaver to change the angle of the blade inside the razor head by twisting the knob at the bottom of the base to create either a wider or narrower gap between the blade and the safety bar. (mistershaver.com)