1/4-Inch Slotted Screw-Holding Screwdriver, 8-Inch Shank Klein Tools K38 Split-blade screw-holding driver wedges into screw slot Positive gripping action holds, starts, and drives slotted screws in awkward, hard-to-reach places Not designed for torquing or tightening Blade thickness of .043-Inch (1 mm) expanding to .085-Inch (2 mm) Klein Tools doesn't just make great products, we make great products that stand up to the demands of the professionals who use them every day ... Since 1857