Professional and exquisite workmanship makes it have uniform particles and hard texture. The wide range of applications allows it to be used in a variety of workplaces. Different specifications make it possible to meet different work requirements. Strong stability and sharp cutting make it very reliable and efficient. Made of brown corundum and high speed steel, it is very durable to use. There are three different specifications (4mm, 4.8mm, 5.5mm) in this set. It can be applied instead of a file and your chain will be pointed as before. The chain does not need to be removed when working. And it is suitable for metal polishing like chainsaw, jade, wood, mold, steel, etc. Item Name: Chainsaw Whetstone Material: High Speed Steel,Brown Corundum Quantity: 3Pcs Shank Type: Round Shank Features: Sturdy, Easy to Install, Strong Stability Size Details: 4mm: 4.5cm x 0.4cm x 0.4cm/1.77" x 0.16" x 0.16" (Approx.) 4.8mm: 4.5cm x 0.48cm x 0.48cm/1.77" x 0.19" x 0.19" (Approx.) 5.5mm: 4.5cm x 0.55cm x 0.55cm/1.77" x 0.22" x 0.22" (Approx.) Shank Diameter: 0.3cm/0.12" (Approx.) Head Length: 2.2cm/0.87" (Approx.) Notes: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Precautions: Electric chain saws generally choose a diameter of 4.0mm. Small chain saws generally choose a diameter of 4.8mm. Large chain saws generally choose a diameter of 5.5mm. Package Includes: 5 x 3 x Chainsaw Whetstones (4mm, 4.8mm, 5.5mm)