A drill bit or interchangeable cutting point used to bore holes in marble, including holes prepared for splitting systems or detailed stone drilling.
Punta di trapano means drill bit. Le voci del marmo indexes punte di trapano among the tools discussed by Rino Giannini.
Stone-drilling points vary according to the intended hole, tool system, and material. They may be used for splitting holes, mechanical fixing, deep recesses, or preliminary waste removal.
Etymology
Italian: punta, “point or bit,” + trapano, “drill.”
Sculptor Notes
The diameter, geometry, and depth of a drilled hole determine what can safely follow it. In splitting work, inaccurate hole spacing or direction can redirect the fracture through valuable stone.
References
https://levocidelmarmo.sns.it/lista_times.php