Wire Twister, Wire Twisting Tool, Spin Twisting Wire Connector Socket, Wire Twister Tool for Drill and Wire Connector Driver with 1/4" Chuck, 1 Pack, Blue - - Amazon.com
Ideal 30-902 Spin-Twist Wire Connector Socket To be used with Corded/Cordless Drill Motors 1/2" Chuck, for Wire Nuts, Wing Nuts, Twisters, B-CAP, and Wing Twisters
The Original Spinner wire connector/wire-nut tool - YouTube