T1 is a document that is a customs guarantee and is used for goods crossing the territory of the EU in transit or to guarantee the delivery of goods from the EU border to a customs warehouse or internal customs or vice versa! 
Today we will tell you exactly which documents are required for execution T1
CMR
invoice
vehicle registration certificate
driver’s passport
export declaration (if available)
information about the point of entry into the territory
packing list
information about all EU transit countries and transit termination points in the EU
Daleth Group: we help you issue a T1 TRANSIT DECLARATION! 
Detailed information about services – dalethgroup.com