GATCO 17002 Knife Clamp Honing Guide. This is a replacement or spare Knife Clamp/Honing Guide for the GATCO Knife Sharpener Systems. The GATCO Knife Clamp/Honing Guide has six sharpening angle choices (30, 25, 22, 19, 15 and 11 degrees) and finger screws that adjust easily without the need of a coin or screwdriver.