Rotary instruments for dental technicians for preparing sintering metal or zirconia in the pre-sintered state. Kit includes seperating cutter for removing from the blank (875521), universal polisher for smoothing the surface (875523), fissure cutter squared for creating fissures (875524), diamond flame for reworking fissures (875526), diamond parallel for creating labial texture (875527), polishing disc without mandrel for thinning out the crown margin (875528), and polisher grenade for grinding connectors (875529).