Description: Repair tool, which is perfect for home improvement, auto repair, and other household maintenance. The tool's surface is plating to prevent rust, durable and fully functional.Repair precision instruments and batch materials. Made of chrome vanadium steel, surface plated and quenched. Does not drop and slip during use. Individual packaging and the top of the plastic has a hanging mouth that can be hung when not in use for convenient storage. Can instantly adjusts to grip hex nuts, hooks, eye and lag screws, bolt heads, and other various shape and size objects. Specification: Material: Chrome vanadium alloy steel 21 Sets: The length of the bit is about 25mm / 0.98inchThe length of the extension rod is about 55mm / 2.17inch Hex shank length: 135 x 12 x 30mm / 5.31 x 0.47 x 1.18inch Lengthened sleeve: 96 x 15 x 31mm / 3.78 x 0.59 x 1.22inch Extension rod: 53mm / 2.09inch Diameter: 11mm / 0.43inch Package: 12 Piece Batches 1 Piece Hex Shank 9 Piece Extension Rod 9 Piece Sleeves (23 Sets) 23 Sets: The length of the bit + sleeve is about 25mm / 0.98inch The length of the extension rod is about 60mm / 2.36inch Hex shank length: 125 x 21mm / 4.92 x 0.83inch Shank length: 72mm / 2.83inch Sleeve diameter: 11mm / 0.43inch Package: 12 Piece Batches 1 Piece Hex Shank 1 Piece Extension Rod 6 Piece Sleeves 1 Piece Extension sleeve (21 Sets) Package Includes: 1 Piece Screwdriver Tool Set