Hex Shank Magnetic Screwdriver Quick Release Extension Holder Bit Set 3Pcs Specification: Brand new and high quality Material: Stainless Steel + Chrome-vanadium Steel Hex Shank: Approx. 1/4"(6.35mm) Length: Approx. 60mm/2.36" 100mm/3.94" 150mm/5.91" Color: As picture shows Features: Interface has a locking mechanism, built-in magnetic, automatically pop up batch head Can extend all kinds of screwdriver bits, screwdriver head conversion uses Fast, fastening; Greatly improve work efficiency Suitable for drill, screwdriver, batch head and other to transfer Package included: 1 x 60 mm/ 2.36 inch Magnetic Extension Drill Bit Holder 1 x 100 mm/ 3.94 inch Magnetic Extension Drill Bit Holder 1 x 150 mm/ 5.91 inch Magnetic Extension Drill Bit Holder