TWIST Mount Double Sided NATO Rail to 15mm RodTWIST Mount EVF Kit with Knuckle includes the Double Sided NATO Rail to 15mm Rod which can attach to a sideways 15mm rod clamp like the optional items Multi Function Rod Bracket (MFRB 15mm LW), Single 15mm Rod Clamp (M4 x 20mm), or Canon 1 4 20 Striped Rosette 15mm Rod Clamp (sold separately). The NATO rail has built in variable friction via the thumbscrew and safety pins are on each end to prevent accidental accessory removal. Combine with any NATO