BRENK-fix® Base holders—the foundation of the system on the railing bar. Secure, all-around fit thanks to clamping technology; M8 internal thread for the point holder. For round bars Ø 10–20 mm, square bars 12 × 12 mm, and flat bars from 20 × 6 to 50 × 10 mm. Available in anodised aluminum 6063 T6 and Stainless steel V2A (AISI 304), polished to 240 grit; Ø 12 mm also available in V4A.