Quick Change Piston Style Tool Post Set - 5 Piece Set for 10-15 Swing (251-200). Quick Change Piston Style Tool Post Set - QCTP 5 Piece Set for 10-15 Swing (251-200). We offer full UK support on all the products we sell. Same day despatch on all items ordered before 15:00 GMT. Set includes one of the following - Standard Tool Holder, Boring Bar Holder, Heavy Duty Boring Bar Holder, Knurling Tool Holder, and Parting Blade. The main tool post body has precision ground dovetails on two sides, which accurately locate the tool holders. The tool holder securely locked into position by ...