Tin-plated copper alloy connector with tin plated silicon bronze hardware. Spacer bar separates dissimilar conductors and provides long contact length,Tightening torque: 500 in -lb,wrench size:3/4 cross flats. Compact, High Strength, Tin Plated Copper Alloy Two-Piece Connector With Spacer And Tin-Plated Silicon Bronze DURIUM Hardware, Recommended For Heavy Duty Connections, Spacer Separates Dissimilar Conductors And Provides Long Contact Length, Neoprene Ring Prevents Loss Of Shorter Bolt During Installation, Longer Peened Bolt Permits Swivel Action For Easier Installation, Use Of PENETROX Joint Compound Recommended With Aluminum And ACSR, Conductor Spacer: Yes, Conductor Type: Run: ACSR, 5005, AAAC, Commercial Stranded Aluminum, Commercial Stranded Copper, Solid Copper, Solid Copperweld, Steel Nominal Diameter, Tap: ACSR, 5005, AAAC, Commercial Stranded Aluminum, Commercial Stranded Copper, Solid Copper, Solid Copperweld, Steel Nominal Diameter, Installation Torque: 500 IN-LB, Length: 1-5/8 IN, Width: 2-1/2 IN, Height: 3-1/2 IN