Our 21mm (7/16BSW) Scaffold Impact Socket complete with Ring & Pin is a robust, fully broached socket for use in scaffold erection.  
This is an industrial quality socket for either ½” Square Drive Cordless or ½” Square Drive Air Impact Wrenches. 

FEATURES
High strength CR/MO Steel for long life
Complete with 'O' ring and retaining pin
Robust socket for any impact wrench
Hexagon 6 sided 

SPECIFICATION
21mm  Hex
½” Square Drive
Overall Length: 52 mm