ToolUSA Ring Stretcher & Reducer: TJ01-09795 This ring size adjuster is effective on plain bands only-not for rings with stone settings This bench tool comes equipped with pre drilled holes for bench mounting This unit is extra strong and durable-heavy duty capacity Measures 5 x 7-1/2 x 17 Inches overall- has a heavy weighted base A great tool for making adjustments in ring sizes- increase or decrease