metal material, wear and corrosion resistant, not easy to rust. The handle has a clear scale for easy torque setting. Storage Box: Comes with a storage box to store these accessories neatly in the box and will not cause confusion or loss. After each use, you just need to put them back in their position. Flexible Operation: This torque wrench kit can be used in both clockwise and counterclockwise directions. The quick-release button makes it easy to assemble and disassemble the bits. Three different kits available for you to choose from: 7PCS (3/8 Inch Drive): 1 * torque wrench (10-60N.m), 3 * connection rods, 3 * bits 15PCS(1/4 Inch Drive): 1 * torque wrench (2-24N.m), 1 * connection rod, 13 * bits 21PCS(1/4 Inch Drive): 1 * torque wrench (2-24N.m), 1* connection rod, 17 * bits, 2 * adapters Specifications: Material: metal Type: 7PCS, 15PCS, 21PCS (optional) Preset ranges: 7PCS: 10-60N.m 15PCS: 2-24N.m 21PCS: 2-24N.m Package size: 7PCS: 380 * 70 * 60mm / 15.0 * 2.8 * 2.4in 15PCS: 265 * 65 * 60mm / 10.4 * 2.6 * 2.4in 21PCS: 265 * 175 * 50mm / 10.4 * 6.9 * 2.0in Package weight: 7PCS: 1372g / 3.0lb 15PCS: 808g / 1.8lb 21PCS: 1116g / 2.5lb 7 PCS Packing List: 1 * Torque Wrench 1 * Connection Rod(3/8*250mm) 2 * Universal Rods(14mm, 16mm) 3 * Bits(T20, T30, T40) 1 * Storage Box OR 15PCS Packing List: 1 * Torque Wrench 1 * Connection Rod(1/4*100mm) 13 * Bits(H2.5, H3, H4, H5, H6, H8, H10, PH1, PH2, PH3, T20, T25, T30) 1 * Storage Box OR 21PCS Packing List: 1 * Torque Wrench 1 * Connection Rod(1/4*100mm) 17 * Bits(T10, T15, T20, T25, T30, PH1, PH2, PH3, H2, H2.5, H3, H4, H5, H6, H8, H10, 1/4*60mm extension rod) 2 * Adapters 1 * Storage Box