Medium Tough Case System Set. Connectable Case allows multiple sets to be stacked and locked together. Compatible with the TSTAK system via the Large Tough Case. Flatwood bits have a bevelled pilot point tip. Bevelled outer cutting edges enable precise positioning of the drill and a clean hole. Flatwood bits have a thick, robust steel shank for added durability. 1/4″ shank ensures easy and slip-proof clamping. Fast and accurate drilling.