http://tinyurl.com/netzo8z
Bosch HC2001B10 5/32-Inch by 4-Inch by 6-Inch Bulldog SDS-Plus Shank Bit 2 CT, 10-Pack
15-percent faster in concrete (compared to S4L)
Optimized brazing and hardening process for long life
Optimized flute design to reduce bit stress and make the bit run cooler
Carbide tipped bit head is harder, tougher, and more resistant to extreme loads
Centric tip for optimal hole geometry