Tempered steel 1 in. Allen 3/32 in. Standard insert bit – designed for professional use Fully Hardened bit production – engineered for today’s tough applications Proven tempering process – Developed to provide increased durability Universal 1/4 in. Hex shank – allows use in standard magnetic bit holders in drills, impact drivers and hammer drill/drivers Precision-formed bit tip – provides proper fit with fastener High-quality tool steel – helps to ensure consistent top quality performance Jobsite-tested Bosch accessories – providing engineering, best materials and innovation