Features: *Made of high quality material with stable performance, firm and wear-resistant. *It is a great converting tool for auto maintenance. *Adopt quenching heat treatment, high hardness, hard to get rust. *Suitable for all kinds of ratchet, ratchet wrench, socket wrench, torque wrench, handle, etc. Specifications: Product name: Extension Rod Kit Material: Vanadium Steel Color: As shown (Silver, Yellow, Red, Blue) Dimensions(approx.): Extension rod : 1/4inch(6.35mm),3/8inch(9.53mm),1/2inch(12.7mm) Reduction sleeve: 1/2" to 3/8"--(12.7mm square hole to 9.53mm square head) 3/8" to 1/4"--(9.53mm square hole to 6.35mm square head) 3/8" to 1/2"--(9.53mm square hole to 12.7mm square head) 1/4" to 3/8"--(6.35mm square hole to 9.53mm square head) Suitable for: all kinds of ratchet, ratchet wrench, socket wrench, torque wrench, handle, etc. Quantity: 7Pcs set Package Included: 3 × Extension Rods 4 × Reduction Sleeves Note: 1.Transition: 1cm=10mm=0.39inch. 2. The real color of the item may be slightly different from the pictures shown on website caused by many factors such as brightness of your monitor and light brightness. 3. Please allow slight manual measurement deviation for the data.