Product parameters: 1. Quickly clamp/release the tool without wrench screw 2. Automatically raise the clamping plate without breaking it by hand 3. The sharpening stone can be rotated about 180 degrees, and there is no need to remove the sharpening rod when the sharpening is changed. 4. The silicone gasket protects the desktop and the blade surface from scratches and sliding 5. Two whetstones can be installed at the same time, and the whetstones can be installed firmly and quickly 6. As a sliding bearing, the linear bearing can slide more smoothly, with less friction and longer service life This knife sharpener contains 8 grinding stones The packaging is ordinary kraft carton, the size is: 34*17.5*7cm The gross weight of the sharpener is 1.22kg