The Hillman Group 90158 6-32-Inch x 3-Inch Round Head Combo Machine Screw, 100-Pack Product Description Machine screws are used with nuts or screwed directly into a threaded receptacle to fasten metal parts together. Measured from the underside of the head to the tip of the screw to obtain fastener length. If nuts are needed, use with nuts of the same finish and threading for proper fit. From the Manufacturer Machine screws are used with nuts or screwed directly into a threaded receptacle to fasten metal parts together. Measured from the underside of the head to the tip of the screw to obtain fastener length. If nuts are needed, use with nuts of the same finish and threading for proper fit. Features Fasten With A Screwdriver To Reduce The Risk Of Over-Tightening To Protect The Screw And Fastened Material If Nuts Are Needed, Use With Nuts Of The Same Finish And Threading For Proper Fit Zinc Plated From The Brand Name: The Hillman Group USA SHIPPING estimates delivery times and we work to get your item to you as quickly as possible and within those times, but please know it may take slightly longer than the estimate.