Surgery Bone Trimmer Set for Low Speed HandpieceSurgery Bone Trimmer Set for Low Speed Handpiece These burs are especially used where bones need to be straightened and shaped. Burs used to trim bone tops They are suitable for use with handpiece It is recommended to use max 25000 cycles. Sterilize before each use 4 Hard Burs and Autoclavable Bur Stands in the Package Hard Bur Models in the Set 71E. 050 , 77E. 040, 77E. 060, 79E. 040, 351E. 060