Armstrong 68-191 19-Inch Wiretwister Deep Reach Wire Twister Pliers and Safety Wire Are Used for Safety-Wiring Fasteners in Aviation and Other Applications Such as Engines Designed for Access Into Close, Tight Clearance Areas Use on wire sizes 0.020" to 0.041" Made in the USA - Quality and Availability Meets or Exceeds ASME B107.18-2003 and US Federal Spec. GGG-W-340B