General description Sealey Premier Non-Sparking Extension Bar 1/2" Square Drive 250mm is designed for professional use, manufactured from Beryllium Copper to ensure safety in environments where sparks could pose a risk. This extension bar features a spring-ball socket retainer for secure attachment to sockets. Technical specifications Material: Beryllium Copper Drive Size: 1/2" Square Length: 250mm Model No.: NS064 EAN: 5054511764130 Other information