8477641 - 

RS SMOR II Retractable Trimming Knife and Blades
Professional heavy duty trimming knife that offers easy blade changes on the various shaped surgical style blades it can hold. It also benefits from a retractable blade that uses audible clicks to indicate mid and rear safety positions.
Handle can also be used with the SM01B, SM02, SM03, SM03B and SM04 blades
Blades are heavy duty carbon steel surgical style
Blades are individually wrapped in V.P.I paper