Specifications: A variety of specifications to meet your work needs and improve work efficiency. The product is chrome-plated and equipped with anti-off elastic ball spring which is safe and practical. Featured with multi-angle rotation it has large torque and is convenient to use. Item Name: Sleeve Adapters Set Material: Chrome Molybdenum Alloy Steel (Black) Chrome Vanadium Alloy Steel (Silver) Quantity: 4Pcs Sleeve Specifications: 3/8 Hole-1/4 Head 1/4 Hole-3/8 Head 1/2 Hole-3/8 Head 3/8 Hole-1/2 Head Features: Durable Easy to Use High Hardness Product Size: 26mm x 16mm/1.02 x 0.63 27mm x 13mm/1.06 x 0.51 36mm x 22mm/1.42 x 0.87 35mm x 18mm/1.38 x 0.71 (Approx.) Notes: Due to the light and screen setting difference the item s color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Package Includes: 4 x Sleeve Adapters