Trend LOC/BLK/PK1 Loc block workpce support 4 pack Loc blocksPack of four interlocking gripping blocks that lock together to allow workpce to be held in place when sanding, drilling and finishing.No need to use clamps. Set-up in seconds. Grips both workpce and bench.Lifts workpce 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.Specification-lng.=67 mmWidth=67 mmHeight=25 mm