Clamp cap tightly & without scratches: Jar opener has 3 metal wheels to fix the cap to prevent slipping, the traditional sharp teeth are replaced by metal wheels with grooves, to protect the cap reduce scratches, don't worry about the bottle cap scratching your hands anymore. Easier to open bottles: Bottle opener has 4.2in ABS handle,use leverage principle is more laborsaving makes opening the bottle easier. It is very useful to the elderly with arthritis and middle-aged people with hand injuries, and children. Adjustable jar lid opener: The distance between the three gears can be adjusted clockwise (smaller) or counterclockwise (larger) to accommodate different sized cans. Easy to open lids of water bottles, soft drink bottles, soda ring pull tabs and beer cans that within 1-3in. Easy-to-use jar gripper: Just follow the steps below to use it: (a)Turn the top knob to the counterclockwise to adjust to the most size. (b)Put the adjusted bottle opener on the bottle cap. (c)Turn the top knob to the clockwise to limit, clamp your bottle cap.(d) Hold the ABS Handle and turn it to the right.