Overall dimensions: 18''W x 21''D x 3.68''D, Basket dimensions: 17''W x 21''D x 3.15''H. Installation requires a minimum of 18 inches of space when slides are mounted on both sides of the drawer box. Suitable for RTA Cabinet B21.If you are not sure, please contact the seller to confirm if it fits your cabinet. STURDY SLIDERS: The cabinet roll out drawer includes 21-inch full-extension drawer slides that are side & bottom mounted. The slides hold up to 100lbs and the solid wood pull out cabinet organizzier is sturdy and durable. RTA (ready to assemble) cabinetsbasket: applicable dimensions refer to the interior width of the cabinet. If your cabinets are not RTA cabinets, please measure the width of the cabinet's interior frame, not the exterior width. SOLID WOOD BOTTOM & MIDDLE MOUNTING: Solid wood pull out cabinet organizer, able to be mounted on the bottom of the cabinet or in the middle of the cabinet. Fully utilize the space inside the cabinet. DIY ASSEMBLY OF CABINET: The assembly process is very simple and the package includes installation accessories. This cabinet pull out tray is perfect for use in pantries, vanities and under sinks! Overall dimensions: 18''W x 21''D x 3.68''D, Basket dimensions: 17''W x 21''D x 3.15''H. Installation requires a minimum of 18 inches of space when slides are mounted on both sides of the drawer box. Suitable for RTA Cabinet B21.If you are not sure, please contact the seller to confirm if it fits your cabinet.