Tools4Boards HONE diamond stones feature premium Swiss-made diamond fabric mounted on exceptionally flat precision milled stainless steel backer. Polishing and deburring ability of a stone combined with the cutting ability of a file! Unlike plastic or aluminum backers the 5/32" (4mm) thick HONE stainless backer will not flex and roll over dulling the cutting surface of the edge. Unique diamond cluster pattern lasts longer than conventional diamond fabric. Stainless steel backer dampens vibration better than conventional plastic or aluminum backers providing superior feel. Perfect for touching up edges and removing burrs on-hill or to smooth and polish edges after filing.