Hex shank: 1/4 hex shank can be easily inserted into power screwdriver, drill and hand screwdriver Product: Magnetic screwdriver bit holder set. Quantity: 3 pieces. Length: 60 mm, 100 mm, 150 mm. Colours: black and silver. Shank: 1/4 hex shank. Chuck: change system and quick release, the interface has a locking mechanism, built-in magnetic, automatic pop-up batch head. Material: stainless steel. Features: suitable for drill, screwdriver , batch head, handheld screwdriver and others to transfer. Extends all types of screwdriver bits, screwdriver head conversion use; quick, fixing; durable, quick change with high efficiency, strong magnet, limit screwdriver position and adjustable. lucky meet Note: The data is all measured manually, please allow 1-3cm error, due to the difference in light and display, there will be a certain color difference, the actual object received shall prevail.