Feature: - Made of high carbon steel material, strong, hard, wear-resistant, durable, long service life; - A variety of hexagonal calibers, suitable for a variety of tools; - Widely used in machinery maintenance, automobile maintenance, home appliance maintenance and other scenarios - Electric extension sleeve kit with portable plastic case for easy storage and carrying; Specification: Type: Pneumatic Extension Set Quantity: 10 Pcs Material: Chrome vanadium steel Colour: Black the inside diameter of: 10 mm / 0.39 inch, 12 mm / 0.47 inch 13 mm / 0.51 inch, 14 mm / 0.55 inch 15 mm / 0.59 inch, 17 mm / 0.67 inch 19 mm / 0.75 inches, 21 mm / 0.83 inches 22 mm / 0.86 inch, 24 mm / 0.94 inch size: 29.00cm 10.00cm 4.50cm Net weight: 1620 grams / 3.57 pounds package includes: 1 Pneumatic extension sleeve set 1 plastic box Havendro 10PCS Deep Impact Socket Set - 1/2" Drive in Black