This connector is a brown, 350 kcmil with a length of 3.380 in (85,9 mm), a 0.720 in (18,3 mm) I.D. and a 1.105 in (28,1 mm) O.D.
The 3M™ Scotchlok™ Aluminum Connector 20011 is for use with copper or aluminum conductors. These aluminum connectors feature color coded end caps for identification. Contact aid provided in connector barrel is compatible with poly/EPR insulations.
Scotchlok Aluminum Compression Connectors - Data Sheet (PDF 37.2 K)