- Self locking - Materials: Pin/shackle: Manganese-phosphate treated steel Press bolt: Aluminium Spring: stainless steel - Max working temperature: +250°C Advantages - Corrosion resistant - Quick and simple to use to carry workpieces with a moveable handle and protection against accidental release. - An H11 toleranced borehole is all that is required, specially tapped holes in pieces to be machined are no longer required