| Four Ratchkey models serve virtually every chuck key need
HC-10 0 - 3/8" drill size, Jacobs KG series chuck keys.
HC-12 3/8" - 1/2" drills (10 mm), Jacobs KK series keys.
HC-14 1/2" (13 mm) - 1/4" pilot - Jacobs K-32 series.
HC-15 1/2" (13 mm) - 6 mm pilot - Röhm style S32A chuck key.
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