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Set screws are used in a variety of tools we carry like screwdrivers and pin punches. They all generally use the same standardized 1.60mm set screw. The set screw, used for holding blades or pins in collets or screwdriver bodies, is extremely small. The thread diameter is 1.60mm and we recommend having a 1.20 or 1.40mm screwdriver on hand when installing it but you may be able to get by with as large at 1.80mm depending on the application. Sold in packs of 3.