The Thomas & Betts MSC250 Shrink-Kon Splice Insulator (3/0 AWG - 300 kcmil) is used to insulate motor stub splices quickly and dependably. It is made of modified neoprene elastomer with nylon straps. Voltage rating: 600V. The re-enterable motor stub insulator meets UL E9809 standard. It comes with a bolt (max length 1-1/2 inch).