* Replacement front and rear wheel QR skewers and QR seatpost clamp that use innovative patented lock system to prevent QR from opening unless bike is tilted over 90 degree level* Simply lock bike with wheels attached so that it cant be tipped more than 90 degree* To unlock, tip bike past 90 degree and open QR levers* Skewer dimensions: 5 x 163mm(0.20" x 6.42"), 5 x 128mm(0.20" x5.04"), 5 x 50mm(0.20" x 1.97")

Model Number: 8400