An expandable clamp includes a band and a worm gear mechanism. The band makes an imaginary circumference and has a number of slots spaced apart from one another along the imaginary circumference. The worm gear mechanism is connected to the band and operates to radially expand and contract the imaginary circumference of the band. The worm gear mechanism includes a worm gear that has a threaded shank that engages the slots when the worm gear is rotated which causes the radial expansion and contraction of the imaginary circumference.