There are a couple of gauges smaller than N gauge, the most recognised being Z and T gauges.To give you an idea...
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Subcategories
711 - Touch-n-Flow Applicator
2800 - Flex Pad Single - Medium 280 grit
542 - Sanding Files 20mm - 4 Piece Assorted Pack (coarse, medium, fine & extrafine) Grit : 100/180, 120/240, 240/320, 400/600
541 - Sanding Files 20mm - 3 Piece Assorted Pack (coarse, medium & fine) Grit 100/180, 120/240, 240/320
361 - Sanding Stick with 6 Assorted Belts - 80, 120, 240, 320, 400 & 600 grit
373 Mini Tapered Hobby Files - 7 Piece Selection Pack
374 Natural Garnet Wood Working Files - 80 / 100 Grits Pack of 2
371 Regular Tapered Hobby Files - 7 Piece Selection Pack
365 - Sanding Stick Refill Belts - Pack of 5 x 240 grit
362 - Sanding Stick Refill Belts - Assorted Pack of 1 x 80, 120, 240, 320, 400 &
364 - Sanding Stick Refill Belts - Pack of 5 x 120 grit
363 - Sanding Stick Refill Belts - Pack of 5 x 80 grit
366 - Sanding Stick Refill Belts - Pack of 5 x 320 grit
367 - Sanding Stick Refill Belts - Pack of 5 x 400 grit
368 - Sanding Stick Refill Belts - Pack of 5 x 600 grit
375 Micro Fine Tapered Hobby Files - 5 Piece Selection Pack
4444 - Sanding Needles - Assorted Pack
007a - Stealth Sanding Frame Set x 1 Frame
10000UF - Flex Pad Single - Ultra Fine 10000 grit
1000T - Grit Tape - Extra Fine 1000 Grit
1000UF - Flex Pad Single - Ultra Fine 1000 grit
1200 - Super Micro Tip Tweezers - 3 Pack
12000 - Micro Finishing Cloth Tape Refill - 12000 Grit
3200-1 - Micro Finishing Cloth Tape Refill - 3200 Grit
150 - Grit Tape - Coarse 150 Grit
1500 - Flex Pad Single - Coarse 150 grit
1500T - Grit Tape - Extra Fine 1500 Grit
1500UF - Flex Pad Single - Ultra Fine 1500 grit
15129 - Micro Finishing Cloth Abrasive Tapes
280 - Grit Tape - Medium 280 Grit
320 - Grit Tape - Fine 320 Grit
369 - Professional Sanding Film Kit
370 - Shape Shifters - Assorted Pack
2002 - Micro Finishing Cloth Abrasive Pads - 3600 Grit
353 - Micro Fine Sanding Kit
2062 - Micro Finishing Cloth Abrasive Refill - 2400 Grit
2001 - Micro Finishing Cloth Abrasive Pads - 3200 Grit
2003 - Micro Finishing Cloth Abrasive Pads - 4000 Grit
2004 - Micro Finishing Cloth Abrasive Pads - 6000 Grit
2005 - Micro Finishing Cloth Abrasive Pads - 8000 Grit
2006 - Micro Finishing Cloth Abrasive Pads - 12000 Grit
2050A - Micro Finishing Cloth Abrasive Sheets with Foam Pad
2060 - Micro Finishing Cloth Abrasive Refill - 1500 Grit
2061 - Micro Finishing Cloth Abrasive Refill - 1800 Grit