Proto® 15 Piece Hex Key Set - Metric ITEM #:J4988M Features and benefits Specifications Features and benefits Metal storage box included. Specifications Unit of Measure Metric Specification ANSI ANSI B18.3.2M Finish Black Oxide Style Standard Arm Piece Count 15 Tips Hex Weight [Lbs] 3.4 Add to Wish list Add to Set Buy Now Print Warranty Share