... to measure thread pitch.Products Types:1.Head Type:Round,Pan,Hex,Flat,Button,Truss,Oval,Binding,Chese,Fillister,etc.2.Drive ... type: Slotted, Hex, Allen, Torx, Spline Drive, etc 3.Mechanical ... .9,Class 12.9Professional as one of the leading titanium button slotted bolts manufacturers, Titanium Industry is also well-known among ...