This multifunction screwdriver set can help you to sovle the problems in your daily or works. It comes with various types of bits such as slotting shape bits, the crossing bits and so on. The adjustable interface allows you to press down to adjust bit length and change bits. If you are looking for this tool, just have a try! Specifications: Material: chrome-vanadium steel Type: 13pcs, 17pcs (optional) 13pcs bits size: U2.3, T5, T6, T7, Y0, 2.0, 3.0, T8, T10, T15, 3.0, 2.3 17pcs bits size: U2.3, U2.6, T10, T15, Y0, Y1, 4.0, 5.0, T20, T25, 4.0(crossing), 5.0(crossing), 2.3(triangles), 2.6(triangles), inner crossing bit, new three points bit 13PCS package size: 150 * 104 * 30mm / 5.9 * 4.1 * 1.2in 17PCS package size: 193 * 130 * 30mm / 7.6 * 5.1 * 1.2in Package weight: 13PCS: 110g / 3.9ounce 17PCS: 214g / 7.5ounce 13PCS Packing List: 1 * Screwdriver 12 * Bits OR 17PCS Packing List: 1 * Screwdriver 16 * Bits