(patented) Releasable arm stay in stainless steel 304, zamak counterplates, 4 pre-assembled grub screws M5x12 in stainless steel. For Euro groove/NC International profiles and for grooves 10×14,3-12×15-14×18-12,5×16,5-13,5×16,5. Weight capacity: 2 arms 70 Kg.