1 x 2.0mm (5/64") drill countersink. 1 x 2.5mm (3/32") drill countersink. 1 x 2.75mm (7/64") drill countersink. 1 x 3.25mm (1/8") drill countersink. 1 x 3.5mm (9/64") drill countersink. Heat treated tool steel countersinks with a HSS drill.
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