Features: Made of high quality stainless steel and chrome vanadium steel, with heavy structure, in order to ensure maximum durability. Extend all kinds of screwdriver bits, screwdriver head conversion uses. It has a strong magnetic conductivity, can connect or disconnect quickly, and ensure that it stays in place while driving. The universal 1/4-inch quick hexagonal handle and 1/4 inch hexagonal socket are suitable for most electric screwdrivers and drills. Small size allows you to extend your bit to any location to complete any work and can accommodate many tool kits. Specifications: Material: stainless steel and chrome vanadium steel Hexagonal shank size: 6.35 mm (1/4 ") Hexagonal slot size: 6.35 mm (1/4 ") Color(Optional): red, yellow Length(Optional): 60 mm (2.36 "), 100 mm (3.93 "), 150 mm (5.9 ") Suggestion: install on electric screwdriver, use it with screwdriver bit. Package Included: 1 x Quick Release Screwdriver Drill Bit Holder