A holder includes a body, the body having a first and second receiver and a first and second cylindrical holder. The holder further includes a tie comprised of an elongated piece of shape-retaining deformable material and a cover covering the shape-retaining deformable material along the length of the elongated piece. The covering and the shape-retaining deformable material are bonded along their length. A first portion of the tie passes through the first cylindrical holder. A second portion of the tie passes through the second cylindrical holder, such that a loop is formed between the body and the tie, stretching from the first cylindrical holder to the second cylindrical holder.

A composite toughened against chipping during machining and other operations includes a substrate and a coating layer includes a substrate and a coating layer. The substrate is titanium or titanium alloys. Nano-holes are formed on a surface of the substrate. The coating layer completely fills in the nano-holes and completely covers the surface of the substrate where the nano-holes are not formed. The disclosure further provides a method for making such composite.