This RWS Thru Bolt wAluminum Lever is the latest version of DT's RWS technology. Where the standard RWS Thru Bolt uses a carbon reinforced plastic lever arm, you'll get a lever made from machined aluminum here. The weight is exactly the same, and you'll perhaps get more durability in the event of a crash with these alloy bits, not to mention the appeal of the more sculpted look. RWS stands for Ratchet Wheelmounting System. It has the look of a quick release minus the springs, but in place of a lever attached to a cam, there's a lever attached to a bolt head. Turn the lever clockwise to tighten. When there is sufficient resistance 15nm, stop turning. Press the red button to position the lever in a place where it won't get knocked around. You're done, and the benefits are pretty obvious. It provides up to 50% greater clamping force than with a conventional quick release, which can be a great thing when riding a disc brake in front as it will resist the twisting forces better. And, they make it super easy to pop your wheels off your bike. The oversized shafts are high strength, light weight 7075 aluminum, as are the lever arms. Want it off' Just start turning the lever counter clockwise to loosen. The DT Swiss RWS Thru Bolt w Aluminum Lever is available to fit three hub configurations Front 9x100mm, Rear 10x135mm, Rear 12x142mm Syntace X 12 type. The weights are as follows: 49g front 9 x 100 63g rear 10 x 135.