1. Universal size: includes 1 red extension socket wrench and 5 nut connectors. The key size is 36 x 1.8 x 1.8 cm. This tubular box wrench is suitable for 8 13mm nuts, 8 12mm nut connectors and 13mm screwdriver at the rear end. It fits tap nuts of different sizes and meets your different size requirements for installing and maintaining accessories. 2. quality materials: our keys are made of durable, quality steel with good rust resistance, are durable and resistant. Thanks to their small size and light weight, they fit comfortably in the hand and are spacesaving. A quality choice you can trust. 3. Easy to use: each adapter of the red layered steel handle is marked with its specifications. Insert the unnumbered end of the adapter into the 13mm drive at the rear end, and the magnet contained in it will tighten the adapter. Thanks to its easy and flexible handling, it is an ideal helper for assembling and disassembling sink accessories. 4. Ergonomic design: the key is ergonomically designed, and the Tshaped push handle allows the operator to easily and precisely introduce force. Thanks to the swivelling handle, even hardtoreach nuts in tight spaces can be easily reached and the left and right threads can be adjusted for assembly and disassembly work.