Features: 1. Application: four indicator holes are supplied in 1mm,2mm,3mm,4mm. 1mm works for extremely narrow frets, likes ukulele; 2mm works for all standard guitars, bass guitar, banjo, mandolin, guitar cigar box; 3mm, 4mm socket works on jumbo sills. This means that it will work on most stringed instruments. 2. One flat file: one flat file, works at the edge of the threshold and the round end of the threshold. You will experience the amazing performance of the diamond. 3. The hand grip is made of solid wood: excellent grip and smooth operation. 4. Diamond Abrasive Way: Diamond abrasive for coarse for this application, use threshold rubber bands makes the thresholds as smooth as buttery. 5. Material: It is made of good quality carbon steel and heavily coated with diamond grits. Which ensure the long life of this file. Description: With lightweight and portable size, this threshold file is easy and convenient to carry and use. Specifications: Material: Carbon Steel + Diamond Grit + Wood Handle Size: 222*125*20*10MM Package Included: 1 * Threshold is your file 2 * Neck protection will extra charges be added Notes:1. Please allow 0-1 inch error due to manual measurement. Thank you for your understanding.2. Monitors are not calibrated same, item color displayed in photos may be showing slightly different from the real object.