10 piece set with the complete Phillips set P1 - P4, and flat tip drivers 3.3mm - 12mm wide bladesS2 Steel, the strongest hardest drivers availableKnurled body for fingertip controlSatin Chrome plated, and marked for easy identificationLifetime WarrantyThis Stubby Flat and Phillips set, is designed as a socket wrench attachment set for close quarter work. Each driver has a 1/4" Square drive and a Phillip or flat tip. All drivers are made with S2 steel and heat treated. Designed with the strength and durability to last!