Roboworm Straight Tail Worm 4-1/2" - Margarita Mutilator. The 4 1/2" Straight Tail is amazing as a dropshot bait, a splitshot worm or anytime you need a true finesse worm. These are the worms that started it all, Roboworm's original straight tail worm. Computer, and robotic engineered precision hand poured style soft plastic worms. The Roboworm straight tail worms excel in all applications, including drop shotting, shakey head, Texas rig, Carolina rig, dart head, split shot rig, flipping' and pitching'.