... :M2-M6 screw 4.Free samples for thumb screw Thumb Screws 1. Head type of thumb screw:KINDS OF HEAD,KNURLED2. Drive of ... ,Hex Socket,Pozi/Cross3. Metric and inch thumb,computer thumb screw,or your requires4. Material of thumb screw :Carbon steel, Alloy steel, stainless ... from M2-M16mm, Inch size from #4-#107. Surface of thumb screw:Plain, black finished, Zinc plated (Galv), Nickel, phosphate black ...