SUTTON TOOLS® 1/4"-Hex Quick-Change Extension Bits fit with 1/4"-Hex Shank Power Bits including Screwdriver Bits, Spade Bits etc.
They can also be used together for extra-long reach applications.
The recessed quick-change spring-loaded sleeve prevents accidental release. Its slim diameter permits passing through holders 18mm and greater.
Specifications

Shank - 1/4"-Hex - With Power Groove
Drive Size: 1/4"-Hex - Quick-Change
Length: 300 mm (12")