The Wera 3/8" VDE extension with increased safety through yellow insulation core, which becomes visible in case of damage to the outer red VDE insulation layer. Individually tested tool as per IEC 60900 at 10,000V for safe working at the approved voltage of 1,000V.

3/8" VDE Zyklop extension
Individually tested tool as per IEC 60900 at 10,000 V
Increased safety due to 2-component isolation with yellow insulation core under red insulation outer layer
Plastic coating protects surfaces from damage
Short version

For VDE insulated 3/8" square drive sockets with ball lock Design Insulated, individually tested as per IEC 60900. Increased safety due to 2-component insulation with yellow insulation core, which becomes visible in case of damage to the outer red VDE insulation layer.