You are looking at PENN-UNION S-4 Split Bolt UL 

- 5 pcs per order

Range for Equal Main & Tap:
8 SOL-4 SOL

Tap Range Using Maximum Main:
16 SOL-4 SOL

Wire Diameter Range (IN) .128 - .204

Recommend Torque:
165 (IN-LB)

- Use this split boly to join two or more ground wires together like a splice

- The nut is backed off, insert wires under the head of bolt & tighten nut

- The nut forces a sliding center T-shaped anvil up against the two wires & crushes them against the underside of the bolt head.

- Made in USA