Sit comfortably in your chair and tie. The lap extension bring the vise closer to you, allowing your back and arms to sit comfortably. This Renzetti C-Clamp Lap extension will fits all vises, the 6" Traveler stainless steel stem is needed for all traveler and tube fly series vises. Shown on a Traveler Vise and a standard C-Clamp. *Vise and C-Clamp not included.