5/16 female to 6mm Male Thread Adapter – nautilusspearfishing

Linghunt - Adapter 5/16-24 Male x 8mm-1.25 Female

Mecmesin Adapter, 5 kN, 5-16 UNC to M6, F to F

6mm Female to 5/16 Male Adapter – nautilusspearfishing

Riffe 8MM (5/16) Female to 6mm Male Adapter – Florida Freedivers

Will allow you to swap threads to 6mm male for IST Pole spears to use flopper or slip tips

IST Pole Spear Adapter to 6mm

ADLERSPEED Straight Aluminum Male Flare -6 an to M16 x 1.5 Male Metric Pipe Fitting Adapter Black, Fittings - Canada

Linghunt Spearo ADAPTERS

Linghunt - Adapter 5/16-24 Male x 6mm-1 Female

Threaded Adapter 5/16 Male to 6mm Female – One Breath Diving

6mm Pole Spear Adapter, Headhunter Spearfishing

SPEARFISHING WORLD Polespear Speartip Threaded Adapter - Solid Stainless Steel - 11mm Female to 6mm Male Standard for Most Spearguns Hawaiian Sling and Pole Spear Speartips : Sports & Outdoors