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The bottom of the SD Front Mask for HERO9 has a screw hole to attach joint adapters including "Direct Base III"
Using [Linear] or [Narrow] won't bring optimal performance of this lens
compatible INON arms evolve to useful item for different applications
For better noticeability
The bottom end is designed to attach Multi Direct Base II products
Sea&Sea DX Extension Ring 20L #topratedproducts The bottom of the SDSea&Sea DX Extension Ring 20L (20mm) for DX NX port (120mm) extended. Compatible with Sea&Sea MDX series housings. Specifications Dimensions (DIAxD): 132 x 35mm 5. 2 x 1. 4 inches Weight: Approx. 170g 6. 0 oz Depth rating: 100m 330ft Construction: Corrosion resistant aluminum alloy (alumite coating)
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US$ 99.99