Oneway Talon Chuck #3 Tower Jaws, Serrated are expertly machined to a depth of 1-1/4" to provide exceptional gripping power and strength for turning large bowls and vases. These serrated Tower Jaws deep holding capability while allowing increased when working on the back of your piece. Designed with a narrower range than profiled jaws, they come at a more price without compromising performance. The top of the internal profile features a dovetailed section with no serrations, making it i for non-marking situations such as when you want to keep the tenon on the bottom of a bowl as a design feature. These jaws have an external (compression) chucking capacity ranging from 3-3/8" to 4-1/2" and an internal (expansion) capacity of 3-7/8" to 5-1/8", making them versatile for various woodworking projects. Model Number: 3660