The Facom 'S' extensions have a 1/2in Drive to fit 1/2in Drive sockets or ratchets. Their extra length means that hard-to-reach bolts and other fasteners are easily accessed for loosening or tightening. The extensions are finished in polished chrome. Performance: Conform to ISO 3316, DIN 3123 and NF ISO 3316. Ref: UTTK13277