Description: The inside material of this sharpener is made of diamond, with the trait of skid-proof, durability, and wearable resistance Small size makes the balde sharpener convenient to fit in your duffle bag/equipment bag with your ice skates A great compact grindstone, coming with a nice pouch to store it in to prevent it from any damage or scratches If you're a hockey player or avid skater, or just go to the rink a lot, this is a nice sharpener tool to keep your blades sharp. One side grinder width is 3 mm, and the other side is 4 mm. Also, it can be adjusted by the screw to reach the appropriate width. Specification: Material: Inside Diamond and Outside Plastic Color: Red/Green/Blue/Black Size (LxHxW): Approx. 2.4x1.1x1.0in/6.1x2.7x2.5cm Diamond: Approx. 0.9x0.4in/23x10mm (Length and Diameter) Package Includes: 1*Skate Sharpener 1*Carry Pouch Bag (2 Pack) Note: Please allow 0.1-0.3mm differences due to manual measurement