STANLEY 10-189C SELF RETRACTING SAFETY BLADE UTILITY KNIFE DURABLE ALL-METAL KNIFE BODY CONSTRUCTION. MACHINE SCREW FIRMLY HOLDS KNIFE BODY TOGETHER - SCREWDRIVER REQUIRED FOR BLADE CHANGE. CONTOURED HANDLE AND TEXTURED DIE-CAST BODY FOR SLIP-RESISTANCE. INTERLOCKING NOSE DESIGN HELPS SECURE BLADE AND HELPS PREVENT BODY SEPARATION. COMES WITH HANG-HOLE FOR ADDING A WRIST STRAP OR LANYARD. AUTO-RETRACTING BLADE SPRING-LOADED. RETRACTS WHEN SLIDE BUTTON IS RELEASED. BLADES INCLUDED (11-987) 1. WORKS WITH MOST STANDARD UTILITY BLADES. FOR USE WITH 11-987 MUST BE 18 YEARS OR OLDER TO PURCHASE THIS PRODUCT