Ergonomic Wooden Handle Design: Smooth contoured handle provides secure grip and reduces hand fatigue during extended woodworking sessions. Ideal for precision sharpening, chamfering, and detailed carpentry tasks. Multi-Size Diamond Coating: Professional-grade 4in/100mm file with electroplated diamond particles ensures aggressive material removal on wood, glass, and metal surfaces. Choose from 3/4/5in versions for project flexibility. Heavy-Duty Construction: Thermally-bonded diamond abrasive surface maintains sharpness for 3x longer than standard files. Perfect for shaping plaster, wallboard, and dense hardwood without slippage. Versatile Workshop Application: Dual-purpose tool handles rough grinding and fine finishing tasks. Cross-compatible with woodturning lathes, garden tool maintenance, and DIY craft projects. User-Centric Support: 24-month craftsmanship warranty with responsive customer service team. Includes illustrated digital guide for optimal sharpening angles and material selection.