Edge Clamp Single Screw - violin… F-Hole Clamps (Set of 4) - stainless steel Item No. JR171010 Lining Clamp - steel F-Hole Clamps (Set of 4) - stainless steel, range: 30mm depth: 30/50/80/100mm × F-Hole Clamps (Set of 4) - stainless steel