• The Chisel and Blade Sharpening Guide is intended for honing high quality tools back to their factory tolerances • The guide features graduated settings, allowing you to achieve a proper 30 degree angle on a variety of blades types • The spring clamp will hold blades up to 2-5/8 wide • All settings will sharpen chisel & plane blades to an angle of 30 gegrees • old blades up to 2-5/8 wide • All settings will sharpen chisel & plane blades to an angle of 30 gegrees.