S2 Steel,the hardest strongest available
XZ14, XZN16, and XZN18 have recessed tips for security fasteners
Tools come assembled on the Magrail TL tool organizer
One piece XZN drivers with 1/4", 3/8" and 1/2" square drives
9 Pcs. Set 4mm, 5mm, 6mm, 8mm, 10mm, 12mm, 14mm, 16mm & 18mm