Draper Socket Converter, 3/8"(F) x 1/4"(M)

Amazon

Manufactured and tested generally in accordance with DIN3122 and ISO3315 Specifications Expert Quality, manufactured from chrome vanadium steel hardened and tempered with a polished finish Spring-loaded ball bearing delivers secure socket holding Color: Blue Size: 3/8" x 1/4"

Electrical World

Expert Quality, manufactured from chrome vanadium steel hardened and tempered with a polished finish. Spring-loaded ball bearing delivers secure socket holding.