This is a 3/8" square-drive bit holder designed to accept 10 mm hex bits and fasteners; it provides a secure interface between 3/8" drive ratchets, torque wrenches or handle tools and 10 mm hex driver bits for general workshop, maintenance and assembly tasks. Its primary use is to convert a 3/8" drive tool into a 10 mm hex driver quickly and reliably, allowing controlled torque application and rapid bit changes.

The bit holder is manufactured from chrome vanadium (Cr-V) steel, heat treated to give good torsional strength and durability for hand-tool applications. The external finish is a chrome-plated satin surface to resist corrosion and ease cleaning. The product is a non-impact accessory and should not be used with impact drivers; for impact use choose a dedicated chrome-molybdenum (Cr-Mo) impact-rated holder. The unit conforms to common socket and accessory dimensions referenced in standards such as DIN 3122 and ISO 2725 where applicable, and it interfaces with standard 3/8" (9.5 mm) square drive tools and 10 mm hex bits in the ISO/ANSI hex profile.

Typical applications include automotive and vehicle maintenance, plant and machinery servicing, electrical and HVAC installation where 10 mm hex fasteners are common, and production-line or maintenance workshops requiring controlled manual torque. The holder’s internal geometry and detent mechanism provide positive seating of 10 mm hex bits and reduce cam-out during tightening or loosening operations. Industries that commonly use this accessory include automotive repair, facilities maintenance, mechanical assembly, and light manufacturing.

Key benefits are corrosion resistance from the chrome finish, reliable strength from Cr-V construction for repeated hand-tool use, and wide compatibility with standard 3/8" drive tools and 10 mm hex bits. The design helps maintain bit alignment and extends bit life by reducing wobble under load. This bit holder is supplied as a practical way to broaden the capability of 3/8" drive toolsets without needing dedicated sockets for every hex size.

Duchy Fasteners stocks this Draper Tools Group bit holder in single units and in multi-packs; check our stock list for available lengths and pack quantities to suit workshop and trade requirements. Model reference DR33369.