Pack: 5 pieces per box. Great for cutting, grinding, polishing. The parameters from left to right are as follows. The max diameter: 1.4mm. Full length: 22.0mm. The max diameter: 1.6mm. Full length: 18.0mm. The max diameter: 3.1mm. 859 820 is a European code, 166 465 is an ISO code. 5 Pieces per Kit. We commited ourselfs to your 100% satisfaction both with our goods and services. Please CONTACT me immediately before leave us neutral feedback or negtive feedback, We will try our best to resolve any problem for you untill you are satisfied. 20-30 days to UK, Germany, French, Australia, Canada, etc, Over 30 days to other countries. Our guarantee does not cover accidental damage or wear of product caused by customer. Thank you very much for your understanding! We’re one of the largest online dental suppliers based on many qualified manufacturers in china. Looking forward to our friendly & win-win cooperation!