High Quality Material Our grinding jig is made of aluminum alloy frame, which is a reliable and durable processing aid. Size: the small grinder is 16 x 6 x 6.5 cm and is suitable for blades of 12 cm and below, and the large grinding device is 25 x 6 x 7.5 cm, suitable for blades of 20 cm and below. Adjustable Angle The grinding tool has a locking knob and is also equipped with a hex key. You can easily rotate the locking knob and thread tension to adjust the guide rail with a sharp angle. This is very practical. Very practical: the double ergonomic handles provide easy to reach operating properties. The most important thing is that the baffle design can block the sparks generated during grinding, effectively protecting your hands. Wide applications: this knife sharpener is perfect for pairing with the belt sander, grinder, sharpening machine, belt knife sharpener, etc.