This connector is an Orange, 3/0 AWG with a length of 2.130 in (54,0 mm), a 0.490 in (12,4 mm) I.D. and a 0.617 in (15,7 mm) O.D.
The 3M™ Scotchlok™ Copper Standard Barrel Connector 10007 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)