Lengths: 21mm, 25mm, 28mm, 31mm packed: 6pcs/box Size: 8,10,15,20,25,30,35,40,45,50,55,60,70,80 Assorted: 15-40, 45-80 1. ISO color coded plastic handle with ISO tip size.2. Silicon Stops.3. Sterilizable Max: 150centigrade.4. Extremely strong, flexible and durable.5. Made of high quality BiTi Alloy.6. With diamond-shape cross section.Packing picture: NiTi K file (hand)