Bosch Expert Range of Accessories Each EXPERT accessory is backed by an innovative Bosch Technology that ensures it is the best your tool can get. Our new top performance range for all trades Longer, tougher, faster: Up to 100x better performance Advanced technologies for the toughest applications Set Features For drilling in all kinds of materials. Centring tip for a precise drilling start and good guidance in the drilled hole. Fine grade high durable carbide - extra long life/best wear resistance. Diameter optimized brazing and hardening technology to increase the robustness of the drill bit and reduce the vibration during drilling. Diamond ground cutting edges - special ground tip enables multi-purpose drilling. 4 flute dura design - reinforced core section for .