3/8-16" Coarse Thread x 2” Thumb Screws with Fluted Rosette Plastic Head Thread Material – Stainless Steel - anti-corrosion and anti-rust. The round fluted head is anti-corrosion and anti-aging, can be used for many years. Easy to install and remove without any other tools, can be used repeatedly Package Content: 4 x Knurled Thread Clamping Knob

3/8" x 2" Thumb Screws with Fluted Round Head - Knurled Knob - Knurled Clamping Knobs Grip Thumb Screw - Male with Fluted Rosette - 3/8-16 Thumb Screw - Black Clamping Knobs With Large Fluted Head - Fluted Knobs With Male Stud - Fluted Knobs 3/8 Bolt 3/8-16" Coarse Thread Premium quality - Made in USA The over sized round Fluted head is 1 1/2” in diameter. Thread Material – Stainless Steel Head Diameter: 1.5" Head Thickness: 3/8" Welcome to Magic Hub store. Your satisfaction is our priority. If there are any questions before and after purchase, please welcome to contact us, we will try my best to solve all for you.