Check the listing for details. Bolt handle ball knob Accuracy International, 1” (25mm), 5/16x24 Thread. Condition: New. Listed at 42.99 USD. Made of thermoplastic / Bakelite material. This ball knob can be used with any bolt handle thread that is 5/16x24. You will get 1 custom bolt handle ball knob shows in the 2nd and 3rd photo.