Shop › Arri Locking Knob (10 Pack) for all 5/8" Stirrup Blocks Image 1 of 1 Arri Locking Knob (10 Pack) for all 5/8" Stirrup Blocks $35.99 Part No: L4.77057.E Arri Locking Knob (10 Pack) for all 5/8" Stirrup Blocks Arri Locking Knob for all 5/8" Stirrup Blocks. This is a pack of 10 knobs. Add To Cart Added! Part No: L4.77057.E Arri Locking Knob (10 Pack) for all 5/8" Stirrup Blocks Arri Locking Knob for all 5/8" Stirrup Blocks. This is a pack of 10 knobs. You Might Also Like Quick View Arri S360 POCO (power control) Quick View Arri Support Casters for Junior Rolling Stands Quick View Arri LE2 Set Upgrade Kit Active L7 Quick View Arri Top Latch for ArriSun 12/18 (Drop-In Style) Quick View Arri Reflector and Screws (for ST2-5, T5, D25-40)