FIELD: machine building.
SUBSTANCE: ply containing polymer composition is made at, at least, one surface of bearing metallic foil of said mask. Said polymer comprises solid lubricant composed by at least one of the following substances zinc molybdate and molybdenum trioxide. Polymer composition ply depth makes 0.02-0.3 mm.
EFFECT: accurate positioning of bores, safety of drill tip.
11 cl, 4 dwg, 1 tbl
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