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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 screw-driver 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 as 1.80mm depending on the application. Sold in package of 3.