Roll-N-Lock M-Series - 20-23 Gladiator without Trail Rail System, 5'The M Series retractable truck bed cover provides you the security of a hard cover, smooth appearance of a soft cover, and convenience of a retractable cover. Its durable vinyl over aluminum hybrid cover design is dedicated to four season protection and optimal bed security. It tackles durability while remaining exceptionally easy to operate with its unique frictionless construction and insulated grip lever. Simply use its key to unlock the cover and