5/32 inch 4.0 mm. Consistent tooth height means files remove more metal faster. Guide marks. Keep correct sling angle by using guide marks as a reference. 1/5th of file diameter is above cutter top. File should be tight in guide groove. Chain Code: A; 25AP; 5/32 inch; 1/4 inch; 30 degrees; 0.25 inch. R; 90PX; 4.5 mm (4.5 mm file diameter recommended 5/32 inch compatible) 5/32 inch; 3/8 inch; 30 degrees; .025 inch. S; 91PX; 5/32 inch; 3/8 inch; 30 degrees; .025 inch. T; 91VXL; 5/32 inch; 3/8 inch; 30 degrees; .025 inch. H, J, L; 20, 21, 22BPX; 3/16 inch; .325 inch; 30 degrees; .025 inch. G; 95VPX; 3/16 inch; .325 inch; 30 degrees; .025 inch. M; 95TXL; 3/16 inch; .325 inch; 30 degrees; .025 inch. D, P; 72, 73V; 7/32 inch; 3/8 inch; 25 degrees; .025 inch. E; 72LPX; 7/32 inch; 3/8 inch; 25 degrees; .025 inch. OregonProducts.com File made in Portugal. File guide made in China.