Mini Size: 5.5inch (140mm) length, 1.97inch (50mm) diamond working length. For working on small, delicate projects. Mainly used for processing hard material, quenched material, glass etc. Wide Applications: Suitable for sanding metal, wood, plastic, marble, stone, glass. Especially perfect for finely grinding models and jewellery, instrument parts, and dies. Non-slip Handle: Dipped handle provides and comfortable grip in use when exposed to fluid or moisture. Features: Organized in a plastic pouch for dust-resistant storage. Titanium plating can offer capability, wear resistance, rust prevention, and long service life. Notice: For long-lasting use, please use a lubricant (such as water) when you use the diamond needle files. colour: gold + blue Material: diamond + steel Size: 3 x 140mm Contents: 10 x Diamond Needle File Set Only the above content, other are not included. Note: Light and different displays may the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.