This double-cylinder hydraulic shear is engineered for 20-38 ton DEVELON and DOOSAN excavators, featuring a main structure built with Hardox steel plates for high mechanical strength and low weight, an imported rotary motor with a bidirectional relief valve to maintain stable hydraulic pressure and protect the system, and heat-treated symmetrical blades that allow reversible use to extend service life, making it suitable for building demolition, cutting and recycling of waste materials, and disaster rescue operations as a reliable attachment for DEVELON and DOOSAN excavators.