I designed this bracelet wanting to make a full metal piece with as simple a mechanism as possible. The shape of the arch and the length of its “arms” allows enough tension to hold the bar in place, making a delightful click when engaged. The bar can be coaxed out of place by gently pulling an arm of the arch and yanking out the bar.

Wrist size for tension shackle is as follows—

Small: 6 1/4 inches

Medium: 7 inches

Large: 8 inches