SUNWAYFOTO LF-M1 Replacement Foot / Sigma 50-600mm f/5-6.3 DG OS HSM Sports 150mm-600mm Lens Arca / RRS Sunway Fixes your lens's Achilles heel. For Sigma 150-600mm f/5-6.3 DG OS HSM Sports. Dual stop safety screws (includes allen wrench) . Net Weight: 162g. Compatible with all Arca style clamps inc Really Right Stuff lever clamps