Pack of four interlocking gripping blocks that lock together to allow workpiece to be held in place when sanding, drilling and finishing. No need to use clamps. Set-up in seconds. Grips both workpiece and bench. Lifts workpiece from bench, to allow complete access to every edge. Can be used for routing when extra care should be taken to prevent material lift. Anti-vibration, non-slip, non-marring rubber pads on both the top and bottom of the blocks. Size when four blocks interlocked 173mm x 173mm. Specifications • Pack Qty: 4 pack Contents: 4 x Blocks