The Maxi-Monkey Jig is capable of making ball knots from 5/8" up to 2 1/4" (cue ball size) in diameter. The Maxi-Monkey Jig features a full metal construction platform. The base is aluminum and comes with (4) zinc plated steel rods for exceptional strength. The steel rods easily screw into the base. The Maxi-Monkey Jig simplifies the ball knot making process and will help produce a nice, even ball knot. Please note that the cores and finished knots shown in the photos are for illustration purposes only and are not included.