3950 PKL 4.0 X 137 MM Stainless Steel Ball End Hex Key. Hex-Plus design provides more surface contact area to prevent rounding. Vacuum ice-hardened stainless steel has the hardness and strength needed for screw fastening tools and will not contaminate the fastener with iron particles. Sold in packages of 10.
WARNING: Cancer and Reproductive Harm—www.P65Warnings.ca.gov
