Whats in the box:2 each 5/16" Bolts, Flat Washers, Lock Washers, and Wing Nuts

Don't always want to dive doubles, but your gear is set up for doubles. The Hollis Single Tank Adapter gives you the versatility of single cylinder use when you have a dual cylinder set up. All you need is the adapter and this set of stainless steel bolts with butterfly nuts which make installation and removal a breeze. Small parts can get misplaced or lost, so having a spare set of hardware can get you out of a bind in an emergency. Bolt Kit makes a great Save-A-Dive Kit item. Bolt Kit comes complete with a set (2 each) of the following: Carriage Bolts 5/16"-18 x1.25", Flat Washers 5/16" .75" OD, Lock Washers 5/16" MD and Wing Nuts 5/16"-18. All components are stainless steel for durability and long life. Kit makes a great Save-a-Dive Kit item.