The Kwikset 83255-001 Set Screw for interior pin and tumbler entry levers is designed to fit standard Kwikset levers and is typically compatible with a 1/16-inch Allen wrench. This screw secures the interior lever and is a direct replacement part for Kwikset products. To ensure a proper fit, confirm that your Kwikset lever uses this specific set screw model. If you're unsure, you can reference the product manual for your lever or contact Kwikset customer support for assistance. Let me know if you need more details!