K-Files 30mm #70 6/Box. Stainless Steel. For instrumentation of root canal procedures. Guaranteed less separation. Can bypass obstructions easily. Provides smooth tactile feel during instrumentation. Kerr K-File prides on the highest durability among all other endodontic hand files used during root canal procedures. K-Files have reduced separation capacity and can easily avoid obstructions during instrumentation.Available in various color-coded #s from # 06 to # 80 and in 21.0 mm, 25 mm, and 30 mm lengths.