Keep your handlebar organized and your devices secure with the LW-STD (22.2/25.4/28.6mm) from Minoura. - Alloy clamp for mounting your own device on handlebar or stem - Lightweight and rustproof aluminum construction - Hex wrench required for instillation and removal - Clamp body has (1) M5 Thread hold in center - 22.2 mm-28.6 mm diameter range