The most basic principle of the manual can opener is to use the gear to drive the sharp blade to make a circular motion to open the can lid. So we improved the precision of the gear, and replaced the ordinary blade with a high carbon steel blade, the sharp blade and the precision gear cooperate well, and the blade can cut the lid smoothly every turn. So you don't have to worry about getting scratched by the edge of the can when scooping food out of the can. We use environmentally friendly rubber on the handle and knob, which greatly improves the grip comfort of the manual can opener, even if there is oil in the hand, it will not slip when opening the can. The knob with increased height and finger contact surface makes the hand less effort when opening the can, and the knob can rotate 360 in both directions, which is an excellent gift for the elderly and arthritis. ALL-IN-ONE DESIGN - Multifunctional Can Opener The built-in bottle opener is specially designed for soda and other bottles with caps, which can meet all your needs, just a simple pry with the hook to easily open celebratory beer and bottled drinks.