Specifications: Made of chrome vanadium alloy steel, the wrench is durable to use and not easy to be deformed. It has T-shape handle, which is convenient to grip. It is used for car parts installation or removal. Item Name: Spark Plug Socket Wrench Material: Chrome Vanadium Alloy Steel Features: Durability, T-shape Handle, Car Accessory Sleeve Depth: 28mm/1.1" (Approx.) Sleeve Thickness: 14mm/16mm/21mm/Extended 16mm/Extended 21mm: 3mm/0.12", 16/21mm: 5mm/0.2" (Approx.) Size Details: 14mm: 22.5cm x 9cm x 2cm/8.86" x 3.54" x 0.79" (Approx.) 16mm: 22.5cm x 9cm x 2cm/8.86" x 3.54" x 0.79" (Approx.) 21mm: 22.5cm x 9cm x 2cm/8.86" x 3.54" x 0.79" (Approx.) Extended 16mm: 27.5cm x 9cm x 2cm/10.83" x 3.54" x 0.79" (Approx.) Extended 21mm: 27.5cm x 9cm x 2cm/10.83" x 3.54" x 0.79" (Approx.) 16/21mm: 22.5cm x 9cm x 2cm/8.86" x 3.54" x 0.79" (Approx.) Notes: Due to the light and screen setting difference, the items color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Package Includes: 1 x Spark Plug Socket Wrench