This go-thru screwdriver set includes a #4 Phillips and a 3/8 in. slotted screwdriver with extra long shafts and magnetized tips to make it easy to reach and retrieve screws in obstructed areas. Precision machined, heat treated tips allow for high torque without slippage and an accurate fit. Square shafts allow wrench-assisted turning on stubborn screws. Heavy duty chrome vanadium blades extend through the handle for strength and durability.