You need a bit more muscle than the 4mm but don't want to overkill with a 6mm. This Ronstan 5mm bow shackle sits right in the middle: 300kg max working load, forged 316 stainless steel, and that wider bow opening so you can run two lines or a wire rope through without a fight. Standard head keeps it compact in a rigging bag. If your current shackle is either too light for the job or too bulky to handle, this is the sweet spot
| brand | Ronstan |
| diameter | 5mm |
| material | 316 grade stainless steel, forged |
| head_type | Standard head |
| shackle_type | Bow shackle (American shackle) |
| max_working_load | 300kg |
| common_name | American Shackle |