https://www.niteize.com/product/Dual-CamJam-Webbing-Tensioner.asp#tabs

The Dual CamJam 1" Webbing Tensioner is uniquely designed to allow
you to create heavy-duty tie-down or connection systems. The durable zinc alloy
buckle features two separate cam locking mechanisms allowing you to slide the
buckle and position it just about anywhere in your configuration. The
proprietary design creates the ability to tighten 1" webbing in either a
straight line or looped configuration, providing the ultimate in versatility and
strength.

https://www.niteize.com/product/Dual-CamJam-Tie-Down-Strap.asp

The Dual CamJam Tie Down System has been masterfully engineered to
secure and lock down your equipment and gear. The innovative Dual CamJam buckle
features not one but two cam locking mechanisms, one on each end of its zinc
alloy body. The system also includes a high density 1" polypropylene webbing
strap with an integrated bar tacked loop on one end. With the buckle independent
of the strap and completely adjustable, this innovative system is the most
versatile tie down you'll ever use.

This system can be used in two ways: a fixed end configuration or a traditional
loop configuration. Watch our How To video in the video tab above to see them in
action.

In the fixed end configuration, the integrated webbing loop allows for easy
attachment of the strap to an anchor point while the loose end can be placed
over or looped around your gear and around the other anchor point. One unique
advantage of the Dual CamJam is that Cam 1 allows you to easily slide it onto
the webbing and to adjust the buckle placement easily and securely within your
configuration. Then complete your configuration by wrapping the strap around
your load and other anchor point and insert the webbing end through Cam 2 to
easily tension the load in place. This set up uses half as much webbing as
traditional tie down straps which function in a looped configuration. The other
major unique advantage of this configuration is that you are able to create a
3-to-1 mechanical advantage. For example, you only need to apply 50 pounds of
force to achieve a 150 pound result - a great advantage over using more
complicated ratcheting cam straps.

With a break strength of 1200 pounds and a working load limit of 400 pounds you
can count on these straps whether hauling small or large items. So hang your
hammock, lock down 2x4's, or strap down your kayak with the versatile and strong
Dual CamJam Tie Down System.

https://smile.amazon.com/Nite-Ize-CJD-11-R3-Webbing-Tensioner/dp/B01NCONO3R/ref=sr_1_3?crid=OY6TD32YETG1&keywords=dual+camjam&qid=1560729222&s=gateway&sprefix=dual+camjam%2Caps%2C445&sr=8-3

https://smile.amazon.com/Nite-Ize-CamJam-Down-Strap/dp/B01M13QUC7/ref=pd_bxgy_60_3/141-9326536-5563327?_encoding=UTF8&pd_rd_i=B01M13QUC7&pd_rd_r=fe8c5cfa-9091-11e9-80ec-3dae99890362&pd_rd_w=TuLtr&pd_rd_wg=QU7xv&pf_rd_p=a2006322-0bc0-4db9-a08e-d168c18ce6f0&pf_rd_r=FVQEJYYXYBCN23NFW629&psc=1&refRID=FVQEJYYXYBCN23NFW629

Thanks to David Glover.