Niti hand use h-files Outstanding flexibility and high torsion Round cross section Silicone stops Length: 21mm, 25mm, 28mm, 31mm Packed 6 pcs to a box, assorted package 15-40, 45-80 Niti engine h-files Outstanding flexibility and high torsion Round cross section Rotary speed 350r/min Length: 21mm, 25mm Packed 6 pcs to a box, assorted package 15-40 Stainless steel hand use h-files Outstanding flexibility and high torsion Round cross section Silicone stops Length: 21mm, 25mm, 28mm, 31mm Packed 6 pcs to a box, assorted package 15-40, 45-80 Stainless steel engine h-files Outstanding flexibility and high torsion Round cross section Rotary speed 350r/min Length: 21mm, 25mm Packed 6 pcs to a box, assorted package 15-40 Packed 6 pcs to a box