Abstract: A lock clamp for locking a camper shell to a pickup box, said lock clamp having a substantially C-shaped clamp with a clamp screw for clamping the sill of a camper to the side rail of the pickup box and a lock, preferably of the tumbler type, said lock being integral with the clamp and including a lock screw operable to abut a planar surface on the clamp screw to prevent rotation thereof. The lock screw is rotated by a key which is insertable into the lock laterally for convenience and so as to displaced from the lock screw.