* Q355B and Q690D is optional for arm box
* Adopt high quality Ningbo connectors
* Reinforced 45# steel for boom seat sleeve
* The ear seat is built with reinforced vertical bar plates
* The middle sleeve of the boom adopts an integral forming process
this is my contact way directly
Sophia W/A: +86 18127591702
Mail: sophia@excavatorboomarm.com
www.excavatorrockbuckets.com