Blue heat activation rotary files are used for root canal treatment in the dental clinic. Pack contains : - 1 x 20/10 - 17 mm. - 1 x 15/03 - 31 mm. - 1 x 20/04 - 31 mm. - 1 x 25/04 - 31 mm. - 1 x 30/04 - 31 mm. - 1 x 35/04 - 31 mm.