A rock drill for drilling in a button for percussion rock drill.The invention relates to a button and a drill bit for rock drilling (30, 50) for percussion drilling comprising a cutting head (39) configured to be connected to one end of a drilling element (33, 53) of a set of drilling, the cutting head t. Endo, a front end (38, 60), seen in the direction of drilling is required, a plurality of buttons (41,42, 56, 59, 80, 90) distributed on the cutting head and at least one of these buttons having a rod portion (41 ', 56' 80 ', 90') of a material of the substrate comprising particles of a first material embedded in a connection phase, being the first material. M. Isa hard than the connection phase.The portion of the stem (41 ', 56', 80 ', 90') comprises at least in part a support section, whose material is harder than the connection phase. At least one of these buttons (41, 42, 56, 80, 90) is free to rotate around its own the axis of symmetry.
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