A thumb screw is designed to be turned using a thumb and finger.Knurls on the side of the head improves the grip.Stainless steel significantly improves resistance to tarnishing or corrosion.Diameter (Nominal): M4Thread Pitch: 0.7Diameter (Dimension): 4mmLength (Nominal): 5mmThread Length: 5mmHead Diameter: 16mmHead Diameter (Minimum): 15.65mmHead Diameter (Maximum): 16.35mmHead Height, Overall: 3.5mmHead Height, Overall (Minimum): 3.2mmHead Height, Overall (Maximum): 3.5mmShoulder Diameter: 8mmShoulder Diameter (Minimum): 7.64mmShoulder Diameter (Maximum): 8mmShoulder Length: 6mmProduct Class: Externally Threaded FastenersOrder: Machine Thread FastenersCategory: Thumb ScrewsSystem of Measurement: MetricBrand: Aspen Fasteners®Head Style: Knurled Flat HeadHead Style Detail: High TypeDrive Style: Thumb DrivePitch: Coarse ThreadThread Length: Full ThreadThread Direction: Right-Hand ThreadMaterial: Stainless SteelMaterial Grade: AISI 303 Stainless Steel (18-8)Coating: UncoatedStandards and Specifications: DIN 464