Craftsman 8 Piece Flathead Screwdriver Set w "18 in 1" Micro Screwdriver set - New. - Full size Flathead Sizes: 1/8 x 2”, 1/8 x 4”, 3/16 x 1 1/2”, 3/16 x 4”, 3/16 x 6”, 3/16 x 9”, 1/4 x 4”, 1/4 x 6”. Perfect for an expert or novice, the Craftsman screwdriver set is designed for ease-of-use, durability and accuracy.