All Steel Heat Treatment Technology:Uniform heat treatment technology, so that the product is not easily broken, improve the service life. Easy Pressure Relief:Adjustable oil return valve, different structure, long service life, no oil leakage. Dual Speed Oil Pump Core:Modified version plunger, three-layer sealing ring isolation without oil leakage. Thickening Design for High Hardness:After thermal treatment, the hardness is higher, die with steel stamp, easy to confirm the model of the die. Insulated Handle Design:Heat treated handle has high strength without deformation, more comfortable and anti-slip., Manufacturer: CWCQGH