SILVA art. no. 378 right hand helical flute interchangeable seat tube reamer in 30.9mm diameter for dropper seatposts. 60mm length, slot 4.5w x 5.5d, taper 3 degrees x 10mm, 14mm bore. NOTE: All interchangeable seat tube reamers have a 14mm bore and mate up to the arbor turned shaft o.d. of 14mm - one arbor works for all interchangeable reamers.
