Ratcheting Offset Slot Screwdriver General Tools® Offset Ratchet Screwdriver. Swift ratcheting motion allows you to remove and install screws with ease, and the offset head provides odd-angle access in obstructed areas. Features two Slotted screwdriver blades and a reversible ratchet. TIPS - 1/4" and 3/8" straight blades. Length = 4" (102mm)