The Injection-Molded 4-RU Studio Flyer Rack Case from SKB is a virtually indestructible waterproof injection-molded case that is lightweight and includes molded-in front and rear rack rails to provide better security and durability for studio equipment during travel. It can be used to store and transport your gear to and from events and gigs. The 4-RU case's rackmounts measure 15" from front rail to rear rail to accommodate deeper equipment. It also provides a 21 x 15.5" adjustable work surface with ample room for laptops or monitors and is equipped with a molded exterior pattern that stacks securely with all SKB Roto Racks for maximum transport convenience. Other features include improved quiet-glide wheels, an easy-to-operate one-button pull handle, and TSA-accessible locking trigger latches. Waterproof & impact-resistant Innovative molded-in front/rear rack rails 4-RU rack and laptop combo case 8 rubber cleats to hold laptop in position during transportation 15" front rail to rear rail depth Laptop work surface: 21 x 15.5" Quiet-glide wheels and pull handle Made in the USA