... established in 2009 is one of the largest manufacturer of Hydraulic Breakers and attachments .Our main products including DBK Series ... Hydraulic Breaker,Front Cylinder,Rear Cylinder,Middle Cylinder,Piston,Inner Bushing, ... Outer Bushing and so on.DBK 750 Hydraulic Breaker Middle Cylinder1.Raw Material:20 Crmo2.Hardness:HRC 58 ...