Irwin 3521111C #8-10 Slotted Power Bit (Pack of 4)

B4R2 B1(New) Irwin 3521111C #8-10 Slotted Power Bit (Pack of 4)-------------------------------* Insert bits can be used for common round, oval and flat-head fasteners.* Insert bits are manufactured with industrial-grade S2 steel for maximum life and durability.* Each insert bit is designed for use in power drill chucks and chuck adapters.Features and further details-------------------------------* 1/4" shank diameter.