This 2-step sharpener is a must-have for any sailor's kit. With its ultra-simple design, sharpening a rigging knife takes less than 30 seconds. The dual-sided mechanism offers both coarse and fine options, which are both set at the proper 20-degree angles, and perfect for any type of straight-edge knife blade. 

QUICK + EASY. To operate, gently draw the blade 3 or 4 times through the "coarse" slot, then again, 3 or 4 times through the "fine" slot. That's it... you're done!