Magnetic Drive Guide Set, Number of Pieces 12, Shank Size 1/4 In., Alloy Tool Steel, For Driving Heat Treated Screws, Such As Sheet Metal, Self Tapping And Self Drilling Screws With Screwguns And Cordless Or Electric Drills, Includes Phillips (1) #0, #1,(3) # 2 #3, Slotted (1) 6-8, 8-10, 10-12, 4 to 11/16 Inch Long Screw Guide Driver, Magnetic Bit Holder