The Swann Morton Premium Retractaway offers the safety of a hand retractable blade mechanism. It is a highly versatile cutting tool produced with crafters, designers, graphic artists and model makers in mind. With easy blade changing it fits and safely retracts surgical blade No 10A. Retractaway Premium Knife set contains 1 Premium Retractaway metal handle & 5 x No. 10A individually packed blades, sealed in a clam pack. Not to be sold to anyone under the age of 18.