Material (straight bolts): E-Cu

as documented on the manufacturer's product page:

Dividing Treston 1940 storage bins – max

The information in this product description is based on the manufacturer's product information from BAHCO (product page) as indicated in the input

Breathable 3D-dry® lining

Bøsning LB-I 2 R,6KT gul/grøn 30V AC/60V DC - 10A CATI Unit(s):Pcs Material (straight bolts): E-CuProduct Overview This insulated, rigid 2 mm socket from STAUBLI is identified as LB I2R (23. 0030 *). The product is manufactured as a turned brass piece with a metal threaded sleeve on the insulation and is intended for permanent mounting in pre drilled plates or enclosures. Electrical connection is made via a 2. 8 mm 0. 8 mm flat tab connection. Functional Features Insulated, rigid 2 mm socket Turned brass material (CuZn) for the contact part