Features: * High hardness, durable, magnetic. * The surface is smooth and is wear-resistant. * Can be used for 1/4" electric, hand screwdriver, drill screwdriver and other tools. Specifications: Product name: Screwdriver bit Material: Stainless steel Alloy Steel Color: As Shown (Rubber Ring Color is Random) Type: Square Head Shaft: 1/4'' Hex Length: 25mm/0.98" Magnetic: Yes Optional Model: Torx6,T8,T9,T10,T15,T20,T25,T27,T30 The T40 Suitable for: 1/4" electric hand screwdriver, drill screwdriver and other tools. Quantity: 4pcs Package includes: 4 screwdrivers Notes: 1. Transition: 1cm = 10mm = 0.39 inch. 2. The actual colors of the item may slightly different from the pictures shown on website caused by many factors such as brightness of your monitor and light brightness.3.Please allow slight manual measurement deviation for the data.