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169PRE-THREAD DRILLING WITH CHAMFERING %u00bd%u0009Chamfering HolderISCAR%u2019s chamfering holders, designated CHAM-RING %u2026 were designed to offer standard chamfering options for producing 30%u02da, 45%u02da and 60%u02da chamfers around holes in the diameter range of 7.5 to 25.9 mm, using ISCAR%u2019s standard UNI-CHAM-DRILL drill type.30o45o60o45o60o30o
