This connector is a Purple, 4/0 AWG with a length of 3.380 in (85.8 mm), a 0.548 in (13,9 mm) I.D. and a 0.687 in (17,4 mm) O.D.
The 3M™ Scotchlok™ Copper Long-Barrel Connector 11008 is used on copper conductors only. It is constructed of one-piece, seamless, high-conductivity copper.
3M™ Lugs and Connectors, 2015 Electrical Products Catalog - Catalog (PDF 2.1 MB)
3M Scotchlok 11000 Series Copper Connector-Long-Barrel to 35kV - Product Selection Guide (PDF 5.8 K)
3M™ Scotchlok™ Copper Compression Connectors, 10000/11000 - Data Sheet (PDF 42.3 K)