Reddit reviews Koch 2305621 Bolt Snap, Double Ended, Stainless Steel
We found 1 Reddit comments about Koch 2305621 Bolt Snap, Double Ended, Stainless Steel. Here are the top ones, ranked by their Reddit score.
Snaps are intended for use around the home and farmFor use with rope, straps, weldless chain, and small diameter cableApplications include marine, pet, luggage repair, camping, gate repair, flag poles etcItem has a stainless steel finish
If you are using a traditional jacket style BCD, many have built-in pockets on the sides. But yes most of the SMBs have built-in D-rings or something that you could attach a double ender to and then clip onto a D-ring on your BCD
As for size they are pretty varied since the size of the SMB can range from 3 feet to 10ft (obviously taller marker means easier to see over waves and such but bigger to store on your person). I'd just google image search scuba SMB or something like that to see some images. Having an instructor demonstrate and instruct is a good idea, as it changes your buoyancy when deployed underwater.
Some other low cost/tech/weight items that might be a good idea are a storm whistle (ie get boat crew's attention) and/or a signal mirror.