Material: plastic, diamond.Size: 7.5cm(2.95in)x3.5cm(1.38in)x2.5cm(1in). Grinding core: coarse core: 80 mesh open-edge diamond, fine core: 400 mesh rough ground diamond.Packing: 1P CIce Skating Edge Blade Sharpener. Sturdy and practical, durable and wear-resistant, highly durable and environmentally safe, can be used for a long time. How to use: Just stick the sharpener on the ice blade and sharpen it back and forth evenly. Suitable for all kinds of ice hockey skates and figure skates. Specification Material: plastic, diamond Size: 7.5cm(2.95in)x3.5cm(1.38in)x2.5cm(1in) Colour: Black Grinding core: coarse core: 80 mesh open-edge diamond, fine core: 400 mesh rough ground diamond Packing: 1P CIce Skating Edge Blade Sharpener Feature Sturdy and practical, durable and wear-resistant, highly durable and environmentally safe, can be used for a long time. How to use: Just stick the sharpener on the ice blade and sharpen it back and forth evenly. The card slot can be selected according to the thickness of the ice skate, the position of the thick and fine grinding core can be adjusted by the detachable screw, and the width of the card slot can be changed. Suitable for all kinds of ice hockey skates and figure skates.