Model Number: all excacator18-#1183 Brand Name: Huitong Machinery Key Specifications/Special Features: Modification rock arm inside the boss full size arm fitted iron sand and cement, more structured, more efficient use of the work, refit good rock arm can reach 17 overall weight tonnage, easy rock mountains attack.Rock excavator arm products using advanced computer 2D, 3D CAD system design, and design system through simulation excavator practical action to ensure the accuracy and reliability of the product, the design engineer through the practical application of knowledge and experience from the stress analysis, aspects of material selection, technical and technological, design and other products to ensure the structural strength, performance and quality, within arm mounting plate with an internal buffer to withstand tensile load, durable, extending the standard excavator arm, plus the long arm excavator life rock arm. ModelTotal Length of swing arm&bucketArm weight(t)Maximum digging radius 30T-40T 5000/3100 10T-16T 6000 40T-50T 5000/3200 10T-20T 6000 50T-60T 5500/3800 10T-26T 6700 60T-80T 6000/4100 10T-28T 7500