Abstract: A bone modelling and guide device comprises a one-piece cylindrical body arranged and defined by two adjacent and concentric cylindrical bearings, one external and the other internal. The external cylindrical bearing has at least two indexing features adjusting to complementary shapes formed on a band joined to a surgical guide. The internal bearing allows passage and guidance of a shaft of a drilling bit. A bottom end of the external cylindrical bearing is bevelled. The guide device can be locked in depth and in rotation during positioning of a body in the band.