Permagrit Holder for Swop Block Sheets 120 x 70mm

HOLDER for Swop Block Sheets.  HOLDER Size 120 x 70mm.  Black plastic holder with felt pad, wing nut fasten.
The interchangeable Steel sheets, range from Fine to XX Coarse.  The sheets fold around the end of the block, the punched holes enable a quick release and secure fit.  SHEET Size 170 x 70mm.

A very popular roughing out block, popular with Stone Masons.

FINE approx. equivalent UK 400 grit sandpaper
MEDIUM approx. equivalent UK 220 grit sandpaper
COARSE approx. equivalent UK 180 grit sandpaper
EXTRA, EXTRA COARSE approx equivalent UK 80 / US 24