It is a Drill Bits Air Screw Driver set for work in wood, which is practical and friendly tool for electrician. Easily switch between bits in seconds. Features: Practical and long service life. Easily switch between bits in seconds. Swivel head flips and locks from drilling to driving. Works with your own power drill. Well packed and assorted in a plastic box for convenient access and storage. Specifications: Color: Silver Material: Chrome-vanadium steel Set Include: 1 Half Time Drill Driver 8 Phillips Bits ( 2 each: PH0, PH1, PH2, PH3 ) 8 Flathead Bits ( 2 each: 1/8'', 5/32'', 3/16'', 1/4'' ) 2 Countersink Bits ( 3/32'' 2.4mm, 1/8 3.2mm ) 1 Allen Wrench Half Time Drill Driver Size: Approx. 14.6 * 1.7cm / 5.7 * 0.6in Flathead Bits Length: Approx. 5cm / 1.9in Package Size: Approx. 19 * 7 * 4cm / 7.4 * 2.7 * 1.5in Package Weight: Approx. 370g / 13oz Package List: 1 * Drill Driver Bit Holder 8 * Phillips Bits 8 * Flathead Bits 2 * Countersink Bits 1 * Hex Socket Wrench 1 * Storage Box