This great 6-piece sanding block kit from Motor Guard has every type of sanding block you'll need to do the job right! Each block is flexible and has its own unique density to accommodate multiple surfaces, contours and edges. All blocks are designed to use 2.75" wide PSA & hook and loop sandpaper. Kit includes; 6.5" Firm hook & loop, 6.5" hole side PSA, 6.5" Soft Side PSA, 6.5" Maximum PSA, 12" Maximum Side PSA and 12" Hook and Loop block.