Includes 1/4" O.D. and 3/8" O.D. Wire Insertion Tools for Use When Installing Wires for Audio Electronics, Aftermarket Lighting, Alarm Systems and Much More. With a sharp point on the end and palm size handle, these tools provide extra leverage to pierce through firewalls, rubber grommets and panels. The 10-1/2" steel tube provides easy access to feed wires through the firewall.