Titan Tools 16136 Tamper Resistant Metric Hex Bit Socket Set - 13 Piece S2 alloy steel bits for strength and durability For use with pin type tamper resistant hex fasteners 1/4" and 3/8" drive bit holders 11 bits: 1.5mm, 2mm, 2.5mm, 3mm, 4mm, 5mm, 5.5mm, 6mm, 7mm, 8mm and 10mm Handy magnetic holder sticks to most metal surfaces