Typically the colder the water the larger the boltsnaps become as gloves get thicker and hands become less dexterous. In warm water the smallest of the boltsnaps can be used on all items, longhoses, SPG's, backup torches and other accessories as the are easy to find with an ungloved warm hand. The 74mm / 1/2" boltsnap remains on the longhose as the water gets colder as a larger boltsnap may obscure a divers vision. The 90mm / 3/4" or 74mm / 1/2" snaps are good for backup lights as chest d-rings can be quite cluttered with stage bottles or lights so keeping boltsnaps on backup lights helps reduce this. 90mm / 3/4" boltsnaps are nice on SPG's as the clip is used quite often and makes it easier to find when the left hip d-ring is full of stage clips. The 110mm Coldwater Boltsnap is perfect for stage bottles as it is nice and large for easy manipulation and the eye of the boltsnap is larger than a standard boltsnap allowing a drygloved finger to be placed through it for easy handling whilst being half the weight and less bulky than the 120mm boltsnap.