Details Hole: There is a hole on the top of the hydraulic expander to put the cord through the hole to ensure the hydraulic expander prevents falling. Precision Threading: The movement of the hydraulic expander has a fine threaded surface making it easier to replace the extension head. Simply twist and change the extension head to different size. Knob:The hydraulic expander has a reset/working knob, which is more durable and convenient than trigger snap buckle. You just need to turn the knob gently. Handle: The handle is made of soft, durable rubber for comfort and effortless use. The uneven design of the handle prevents slipping. Automatic restraint spring: The hydraulic expander adopts the auto-assignment spring device, which makes operation quiet and easy. Toolbox: The tool box is made of high quality plastic, sturdy and durable. Specifications Model: ST-300A Material: Steel,Aluminum,Rubber,PlasticColor: Green Process: CNC Gross Weight: 3.75kg/8.26lbs Net Weight: 3.2kg/7.05lbs Duct Head Size: 10mm / 3/8"; 12mm / 1/2"; 16mm / 5/8"; 19mm / 3/4"; 222mm/ 7/8 Inch; 25mm/ 1Inch; 28mm/ 1-1/8inch Cutting Range: 5-32mm/3/16-1/4in Package Size: 42*29*8cm/16.53*11.41*3.14in Tool Box Size: 42*10*30cm/16.54*3.94*1.81in Contents: 1 piece. Hydraulic Diffuser 1 tube cutter 7 extension tips 1 English user manual 1 tool box Note: Please read the instruction carefully before use. If you have any questions, please feel free to contact us, we will solve it for you ASAP