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Retention knobs (pull studs), including High Torque knobs. Retention knobs made in Fairport Harbor, Ohio, including JM’s patented High Torque knobs, which reach deeper into the holder so tightening doesn’t swell the taper. Standard and High Torque knobs in 8620H and 9310H (HS) steel, CAT, BT and DIN, each matched to the machines that take it. Parts not on the shelf in Morgan Hill ship from JM Performance.